Osprey Aether Pro 70 S / Kepler Grey
The Aether Pro was carried by Nims Purja as he became the fastest person on Earth to climb all 14 of the world's 8, 000 plus peaks in less than 7 months. The previous world record? 7 years. A tough yet light pack designed for adventures where dependability is key. Completely stripped down, streamlined and svelte, the Aether Pro 70 is made for type-two adventures that span days or months; alpine climbing expeditions with remote basecamps, or boundary-pushing long-distance hikes through unknown landscapes where the only trail is the one you make. With one zipper, minimal fuss and strengthened hardware, this pack provides worry-free dependability in the harshest of conditions. Stripped down, lightweight for moving fast and getting the job done. The Aether Pro doesn’t just carry heavy loads well, it fits bodies of all shapes and sizes. These packs are built for those who appreciate efficiency and create their own specific systems of organisation based on their unique needs, whether expedition mountaineer or explorer of points unknown. Created with Nano Fly fabric, a tried-and-trusted backsystem and an extremely efficient main compartment design, these packs are built for those who appreciate simplicity and are used to creating a backpacking system to suit their own needs. These are packs for expert backpackers.
The Aether Pro was carried by Nims Purja as he became the fastest person on Earth to climb all 14 of the world's 8, 000 plus peaks in less than 7 months. The previous world record? 7 years. A tough yet light pack designed for adventures where dependability is key. Completely stripped down, streamlined and svelte, the Aether Pro 70 is made for type-two adventures that span days or months; alpine climbing expeditions with remote basecamps, or boundary-pushing long-distance hikes through unknown landscapes where the only trail is the one you make. With one zipper, minimal fuss and strengthened hardware, this pack provides worry-free dependability in the harshest of conditions. Stripped down, lightweight for moving fast and getting the job done. The Aether Pro doesn’t just carry heavy loads well, it fits bodies of all shapes and sizes. These packs are built for those who appreciate efficiency and create their own specific systems of organisation based on their unique needs, whether expedition mountaineer or explorer of points unknown. Created with Nano Fly fabric, a tried-and-trusted backsystem and an extremely efficient main compartment design, these packs are built for those who appreciate simplicity and are used to creating a backpacking system to suit their own needs. These are packs for expert backpackers.
The Aether Pro was carried by Nims Purja as he became the fastest person on Earth to climb all 14 of the world's 8, 000 plus peaks in less than 7 months. The previous world record? 7 years. A tough yet light pack designed for adventures where dependability is key. Completely stripped down, streamlined and svelte, the Aether Pro 70 is made for type-two adventures that span days or months; alpine climbing expeditions with remote basecamps, or boundary-pushing long-distance hikes through unknown landscapes where the only trail is the one you make. With one zipper, minimal fuss and strengthened hardware, this pack provides worry-free dependability in the harshest of conditions. Stripped down, lightweight for moving fast and getting the job done. The Aether Pro doesn’t just carry heavy loads well, it fits bodies of all shapes and sizes. These packs are built for those who appreciate efficiency and create their own specific systems of organisation based on their unique needs, whether expedition mountaineer or explorer of points unknown. Created with Nano Fly fabric, a tried-and-trusted backsystem and an extremely efficient main compartment design, these packs are built for those who appreciate simplicity and are used to creating a backpacking system to suit their own needs. These are packs for expert backpackers.
The Aether Pro was carried by Nims Purja as he became the fastest person on Earth to climb all 14 of the world's 8, 000 plus peaks in less than 7 months. The previous world record? 7 years. A tough yet light pack designed for adventures where dependability is key. Completely stripped down, streamlined and svelte, the Aether Pro 70 is made for type-two adventures that span days or months; alpine climbing expeditions with remote basecamps, or boundary-pushing long-distance hikes through unknown landscapes where the only trail is the one you make. With one zipper, minimal fuss and strengthened hardware, this pack provides worry-free dependability in the harshest of conditions. Stripped down, lightweight for moving fast and getting the job done. The Aether Pro doesn’t just carry heavy loads well, it fits bodies of all shapes and sizes. These packs are built for those who appreciate efficiency and create their own specific systems of organisation based on their unique needs, whether expedition mountaineer or explorer of points unknown. Created with Nano Fly fabric, a tried-and-trusted backsystem and an extremely efficient main compartment design, these packs are built for those who appreciate simplicity and are used to creating a backpacking system to suit their own needs. These are packs for expert backpackers.
in 3 offers
The lowest price for Osprey Aether Pro 70 S / Kepler Grey right now is $526.95 at Seven Horizons, compared across 3 retailers.
The all-time low was $356.90 on 13 June 2024 — today's price is 48% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 8 Sept 2026.
Last updated at 08/09/2026 22:04:36
Osprey Aether Pro 70 Men's 70 Litre Lightweight Hiking Expedition Mountaineering Backpack
Delivery $14.95
Osprey Aether Pro 70L Backpack
Free delivery
Osprey Aether Pro 70 Litre Mens Hiking Backpack - S / Grey
Free delivery between Thu – Sat
originally posted on osprey.com
3 seasons of use, hold up perfectly well. A strip-down \ less featured pack and it works perfectly. All the extra features that I thought would be nice to have from fully featured Aether are not needed. The removable lid makes a nice daypack when you are able to leave your gear at the campground. All the attachment points for outside mounting gear are extremely durable.The things to consider... 1. One of the hip pockets is not zippered, I did drop things out of it a few times bending and now use it for water bottles mainly (because mesh side pockets do no exist on this pack) so you have only one quick access secure hip pocket ( but do you really need more? ). 2. You can only load and unload from the top, sometimes I see people unpacking through the middle of the ... More3 seasons of use, hold up perfectly well. A strip-down \ less featured pack and it works perfectly. All the extra features that I thought would be nice to have from fully featured Aether are not needed. The removable lid makes a nice daypack when you are able to leave your gear at the campground. All the attachment points for outside mounting gear are extremely durable.The things to consider... 1. One of the hip pockets is not zippered, I did drop things out of it a few times bending and now use it for water bottles mainly (because mesh side pockets do no exist on this pack) so you have only one quick access secure hip pocket ( but do you really need more? ). 2. You can only load and unload from the top, sometimes I see people unpacking through the middle of the pack by unzippering the entire front panel and it makes me want to have one... but other than "want" there is really no need for it. 3. Same goes for the separate zippered bottom section that is usually separated from the main compartment... seems like nice to have but in reality, the lack of one allows to use more space inside more efficiently.. 4. The only thing I think I miss is shove-it pocket on the outside, the straps allow me to secure whatever I need on outside, but shove-it pocket is just 10times faster and easier to use.Overall I would choose this one over regular Aether. Weight savings didn't compromise this pack's durability, I feel like after 3 years of use I still have another 7 for sure. Worst case scenario - I am betting on Osprey's warranty.
originally posted on osprey.com
My outings contain a lot of bushwacking and rugged terrain, so I was excited about the streamlined, minimalist qualities of this bag (which it delivers on), but the bag is not nearly as durable as it is described to be. I've used the pack for the past two hiking and ski-touring seasons and I have numerous nicks/tears in the fabric of the body and the zipper on the hip pouch has broken. In terms of comfort, the hip belt is great but the shoulder straps are very stiff and uncomfortable. I haven't yet found a good way to load/adjust the pack so that the shoulder straps don't dig into the collarbones.
originally posted on REI
So disappointed. I returned this pack after a weekend shake down trip with it. I was excited about a tough yet lightweight pack that can actually handle a heavy load and doesn't have unnecessary gimmicks like main compartment zippers that will eventually fail. But there's a fatal flaw: even with the small frame size properly adjusted, I hit my head on the frame when I look up. Not acceptable, particularly for a pack marketed for scrambling. For reference, I'm 5'4" and I used it for an overnighter with climbing gear, about 40 lbs total.Other less important nits include the large hip belt that can interfere a bit with leg movement when high stepping, clunky hip belt pockets that nonetheless aren't all that big, and the lack of vertical side pockets that left me with ... MoreSo disappointed. I returned this pack after a weekend shake down trip with it. I was excited about a tough yet lightweight pack that can actually handle a heavy load and doesn't have unnecessary gimmicks like main compartment zippers that will eventually fail. But there's a fatal flaw: even with the small frame size properly adjusted, I hit my head on the frame when I look up. Not acceptable, particularly for a pack marketed for scrambling. For reference, I'm 5'4" and I used it for an overnighter with climbing gear, about 40 lbs total.Other less important nits include the large hip belt that can interfere a bit with leg movement when high stepping, clunky hip belt pockets that nonetheless aren't all that big, and the lack of vertical side pockets that left me with no place to stash my folded trekking pole where I can grab it without taking off the pack off. The extra flap under the removable lid is a bit awkward when the lid is on.Pros are that the pack can definitely support a 50+ lb load and the material seems rugged enough for bushwacking and rock scrambling. A new version could fix the head bashing problem simply by making a cutout in the framesheet while keeping the vertical stays the same. (I considered modifying it myself, but didn't feel like cutting open a $400 pack to make it fit.)
| Pack Type | Multi-Day Pack |
| Pack Volume | 70 liters |
| Pack Loading | Top |
| Dimensions | 85 x 40 x 33 cm |
Osprey Aether Pro 70 Men's 70 Litre Lightweight Hiking Expedition Mountaineering Backpack
Delivery $14.95
Osprey Aether Pro 70L Backpack
Free delivery
Osprey Aether Pro 70 Litre Mens Hiking Backpack - S / Grey
Free delivery between Thu – Sat
3 seasons of use, hold up perfectly well. A strip-down \ less featured pack and it works perfectly. All the extra features that I thought would be nice to have from fully featured Aether are not needed. The removable lid makes a nice daypack when you are able to leave your gear at the campground. All the attachment points for outside mounting gear are extremely durable.The things to consider... 1. One of the hip pockets is not zippered, I did drop things out of it a few times bending and now use it for water bottles mainly (because mesh side pockets do no exist on this pack) so you have only one quick access secure hip pocket ( but do you really need more? ). 2. You can only load and unload from the top, sometimes I see people unpacking through the middle of the ... More3 seasons of use, hold up perfectly well. A strip-down \ less featured pack and it works perfectly. All the extra features that I thought would be nice to have from fully featured Aether are not needed. The removable lid makes a nice daypack when you are able to leave your gear at the campground. All the attachment points for outside mounting gear are extremely durable.The things to consider... 1. One of the hip pockets is not zippered, I did drop things out of it a few times bending and now use it for water bottles mainly (because mesh side pockets do no exist on this pack) so you have only one quick access secure hip pocket ( but do you really need more? ). 2. You can only load and unload from the top, sometimes I see people unpacking through the middle of the pack by unzippering the entire front panel and it makes me want to have one... but other than "want" there is really no need for it. 3. Same goes for the separate zippered bottom section that is usually separated from the main compartment... seems like nice to have but in reality, the lack of one allows to use more space inside more efficiently.. 4. The only thing I think I miss is shove-it pocket on the outside, the straps allow me to secure whatever I need on outside, but shove-it pocket is just 10times faster and easier to use.Overall I would choose this one over regular Aether. Weight savings didn't compromise this pack's durability, I feel like after 3 years of use I still have another 7 for sure. Worst case scenario - I am betting on Osprey's warranty.
My outings contain a lot of bushwacking and rugged terrain, so I was excited about the streamlined, minimalist qualities of this bag (which it delivers on), but the bag is not nearly as durable as it is described to be. I've used the pack for the past two hiking and ski-touring seasons and I have numerous nicks/tears in the fabric of the body and the zipper on the hip pouch has broken. In terms of comfort, the hip belt is great but the shoulder straps are very stiff and uncomfortable. I haven't yet found a good way to load/adjust the pack so that the shoulder straps don't dig into the collarbones.
So disappointed. I returned this pack after a weekend shake down trip with it. I was excited about a tough yet lightweight pack that can actually handle a heavy load and doesn't have unnecessary gimmicks like main compartment zippers that will eventually fail. But there's a fatal flaw: even with the small frame size properly adjusted, I hit my head on the frame when I look up. Not acceptable, particularly for a pack marketed for scrambling. For reference, I'm 5'4" and I used it for an overnighter with climbing gear, about 40 lbs total.Other less important nits include the large hip belt that can interfere a bit with leg movement when high stepping, clunky hip belt pockets that nonetheless aren't all that big, and the lack of vertical side pockets that left me with ... MoreSo disappointed. I returned this pack after a weekend shake down trip with it. I was excited about a tough yet lightweight pack that can actually handle a heavy load and doesn't have unnecessary gimmicks like main compartment zippers that will eventually fail. But there's a fatal flaw: even with the small frame size properly adjusted, I hit my head on the frame when I look up. Not acceptable, particularly for a pack marketed for scrambling. For reference, I'm 5'4" and I used it for an overnighter with climbing gear, about 40 lbs total.Other less important nits include the large hip belt that can interfere a bit with leg movement when high stepping, clunky hip belt pockets that nonetheless aren't all that big, and the lack of vertical side pockets that left me with no place to stash my folded trekking pole where I can grab it without taking off the pack off. The extra flap under the removable lid is a bit awkward when the lid is on.Pros are that the pack can definitely support a 50+ lb load and the material seems rugged enough for bushwacking and rock scrambling. A new version could fix the head bashing problem simply by making a cutout in the framesheet while keeping the vertical stays the same. (I considered modifying it myself, but didn't feel like cutting open a $400 pack to make it fit.)
This is a great pack if you want to go lightweight but not all the way to ultralight. The highlight is the suspension - it has a fantastic hip belt and perfect shoulder straps. Nothing else feels this good until you get into expedition packs (like huge Mystery Ranch packs) but those packs are literally double the weight. I've had over 50 pounds in this and it is very solid. Let me reiterate - the hip belt is FANTASTIC. Weekenders with bags of wine and steaks? No problem.I have a Daylite that straps securely to this for shoulder season or longer trips where I want a little more space. I love that I can remove the lid and hip pockets to turn this into a summit pack.I will say I'm a little dubious about 70 liters. It seems more like the 55-60 liter range. Maybe 70 ... MoreThis is a great pack if you want to go lightweight but not all the way to ultralight. The highlight is the suspension - it has a fantastic hip belt and perfect shoulder straps. Nothing else feels this good until you get into expedition packs (like huge Mystery Ranch packs) but those packs are literally double the weight. I've had over 50 pounds in this and it is very solid. Let me reiterate - the hip belt is FANTASTIC. Weekenders with bags of wine and steaks? No problem.I have a Daylite that straps securely to this for shoulder season or longer trips where I want a little more space. I love that I can remove the lid and hip pockets to turn this into a summit pack.I will say I'm a little dubious about 70 liters. It seems more like the 55-60 liter range. Maybe 70 if you fill the main bag so much you can't cinch it... But that's fine - I just add my Daylite if needed and it's still plenty light. There are also other add-on pack bags you could add that are much lighter. (Exped, maybe hyperlight)All in all I find myself wishing there were more packs like this on the market. Nearly every other one is adding as many bells and whistles as possible and those all add up in weight. It's nice to go the other direction.
I have been an avid backpacker for over 20 years and have never had a more perfect pack! I love everything about this bag. It is slick and so well designed and ergonomic, even with packing to volume/max weight I can barley feel the bag. I carry most of the gear for my son and I and this bag is the perfect size for 5+ nights. Love the minimalist approach - it is super streamlined and is the least bulky bag I have seen or owned even at capacity - for me it works perfect slightly larger volume than others I've owned but I don't like anything in the outside of my pack and the added volume is compensated for by superior design. I hope this lasts me forever!
If you’re doing alpine climbs with base camps or long hikes where every pound matters, this is your pack. The only other competition is the hyperlite but this will carry 40lb+ MUCH better.For everyone who is inexperienced, don’t fall for the scam of endless pockets. It just makes it harder to pack and add weight. This thing has all the pockets you need (hip pocket and lid, water bottle pouch ). You can easily rig your sleep pad, crampons, ice axe, pickets and rope to this pack as well. Dries EXTREMELY quick.
I have started a lifestyle of travelling the world, so I naturally needed to have all my possessions fit into a single backpack. This one I can't praise enough. It's super lightweight and comfortable even under full load and on multiple days walking trips. All the pockets are right where you need them. It's super durable and water resistant so you don't need a rain cover. I had it in the checked baggage on airplanes multiple times and nothing got damaged. The ventilation is superb - even in 30+ degrees whole day walking is pretty much fine. Thank you guys for developing such an awesome product. It's like an iPhone among backpacks.
Had it several months now and very happy with it. You do feel the difference in weight (light) but it is a solid rucksack as well. I am a fan of minimal design - no bulging pockets etc and having a straight simple pack to fill. The pocket on the hip belt takes a 1L nalgene bottle perfectly and it is easy to get out and put back on the move. Only 2 minor gripes - I miss a small bottom side poclet to put in tent poles etc (stop them dropping down), and the side straps are not long enough to hold anything except say, a bit of clothing taken off. They function just to pull in the sack if you are not using all the space in the pack. I would have preferred longer straps to secure say, a light foam sleeping mat if needed.
Firstly the bag has been solid the few times I've used it on my big trips.However on my last hike through the Annapurna Circuit the hipbelt foam broke down, became deformed and bulged, making it uncomfortable.I have been a lifelong osprey fan buying many bags over the years.Luckily this is the first time I've had to call upon the guarantee, obviously wear and tear is just that so I have replaced bags along the way. Unfortunately ospreys response has been terrible.Their response.... They can't help.. Hold on this is a current model with replaceable hipbelts. You can help, offer me a replacement, ask for it to be sent in for inspection. The fact you say you haven't seen this before would logically make it more likely to be an anomaly in the manufacturing ... MoreFirstly the bag has been solid the few times I've used it on my big trips.However on my last hike through the Annapurna Circuit the hipbelt foam broke down, became deformed and bulged, making it uncomfortable.I have been a lifelong osprey fan buying many bags over the years.Luckily this is the first time I've had to call upon the guarantee, obviously wear and tear is just that so I have replaced bags along the way. Unfortunately ospreys response has been terrible.Their response.... They can't help.. Hold on this is a current model with replaceable hipbelts. You can help, offer me a replacement, ask for it to be sent in for inspection. The fact you say you haven't seen this before would logically make it more likely to be an anomaly in the manufacturing process.I wonder if Nimsdai would have the same treatment 🤣.Come on Osprey do better, be better. Lost a loyal customer. Guarantee not worth a mention. Customer service, non existant. What a shame.
It seems like most backpacking packs fit into one of two categories: either full-featured and heavy, or lightweight but uncomfortable with heavy loads. The Osprey Aether Pro is an excellent pack that mostly fills the void between those two categories. It's great for carrying a full load, but isn't weighed down by useless features such as lots of pockets or a dedicated sleeping bag compartment. (I've never understood the point of those. The LAST thing you need quick access to is a sleeping bag!) After using the pack for two backpacking trips totaling nine days, here are my impressions.The Aether Pro comfortably carries loads of at least 50 lbs. It's at least as comfortable as my old Gregory Baltoro, or the Black Diamond Mission which I use for mountaineering. ... MoreIt seems like most backpacking packs fit into one of two categories: either full-featured and heavy, or lightweight but uncomfortable with heavy loads. The Osprey Aether Pro is an excellent pack that mostly fills the void between those two categories. It's great for carrying a full load, but isn't weighed down by useless features such as lots of pockets or a dedicated sleeping bag compartment. (I've never understood the point of those. The LAST thing you need quick access to is a sleeping bag!) After using the pack for two backpacking trips totaling nine days, here are my impressions.The Aether Pro comfortably carries loads of at least 50 lbs. It's at least as comfortable as my old Gregory Baltoro, or the Black Diamond Mission which I use for mountaineering. Suspension is excellent and back ventilation seems quite adequate, although I haven't tried it in a hot environment. The back compression straps allow snowshoes, trekking poles, or ice tools to be secured to the back of the pack. The hydration reservoir pocket comfortably accommodates my 3 liter Platypus. The pack not only comes in three different torso sizes but can also be easily adjusted: the hook-and-loop back height adjustment holds securely, and the load lifter straps can be routed either underneath or above the tops of the shoulder straps.My size medium pack weighed 1840 grams with all the features attached. I stripped off most of the removable features: the left hip zippered pocket, the right hip cinch-closure water bottle pocket (not easy to use, and anyway I prefer hydration reservoirs), the two male clips for the hip pockets, the straps for a closed-cell mattress pad (I use an inflatable mattress for backpacking), the ice tool loops (if I'm climbing, I use a different pack), and the "Stow on the Go" trekking pole attachment loop (a useless gimmick). I did leave on the side compression straps and the lid. The net weight of my pack is 1652 grams, which is pretty light considering how comfortably it carries loads.There are a few features that could use minor improvement. The "Flapjacket" on top of the pack is a clever idea but can't be removed, so if you use the lid, there's a superfluous piece of fabric which adds weight and gets in your way. It would be preferable to make the Flapjacket removable, just like the lid - then you could use just one or the other. The lid itself only has one pocket; I personally prefer a second pocket on the underside of the lid, where I can put items that I'm unlikely to need during the course of the day (first aid kid, headlamp, etc.). There is a clip inside the lid pocket which is very poorly designed: the gate of the clip has a lip which allows items to easily become detached. Anything you fasten to the clip is likely to work its way loose as you hike. The first time I used the pack, my car keys slipped off the clip during the course of the day! Fortunately I discovered this before they fell out of the lid during a snack break. The lip on the clip gate completely defeats the point of the clip, but the fix is easy: although it's sewn into the pack, you can cut or break it off, and then use the resultant fabric loop to attach a carabiner (even a full size one will fit) or split-ring keyring. Finally, the metal loops which the side compression straps slide through are a bit loose and tend to twist as you tighten the straps.These small issues aside, this is an outstanding pack. I commend Osprey for coming up with a product that bridges the gap between conventional and ultralight backpacks.By the way, after I purchased this pack from REI, I discovered that the hip belt had been installed upside-down! After confirming this with Osprey's customer support people, I removed and reinstalled the hip belt. It was easy enough to do but it did have an effect on the sizing of the pack.
| Pack Type | Multi-Day Pack |
| Pack Volume | 70 liters |
| Pack Loading | Top |
| Dimensions | 85 x 40 x 33 cm |
