Hydro Flask Standard Flex Straw Cap 21oz Black
Take your refreshment with you in this insulated Hydro Flask water bottle, powder-coated for an easy grip that's sweat-free and durable. Thanks to the brand's TempShield double-walled, vacuum-insulated technology, it guards the temperature of your drink, keeping beverages cold up to 24 hours and hot up to 12 hours when using the lid. Made with pro-grade stainless steel, a robust metal known for its resistance and purity, the bottle protects against the transfer of flavours, keeping your water pure-tasting. The durable construction ensures no condensation or heat transfer to the outside of the bottle. A powder coating makes cleaning a breeze. Both the bottle and its lid are dishwasher safe. The bottle comes with a carry handle for drinking on the go. The leak-proof Flex Straw Lid allows for easy drinking with just one hand. Fits most cupholders.
Take your refreshment with you in this insulated Hydro Flask water bottle, powder-coated for an easy grip that's sweat-free and durable. Thanks to the brand's TempShield double-walled, vacuum-insulated technology, it guards the temperature of your drink, keeping beverages cold up to 24 hours and hot up to 12 hours when using the lid. Made with pro-grade stainless steel, a robust metal known for its resistance and purity, the bottle protects against the transfer of flavours, keeping your water pure-tasting. The durable construction ensures no condensation or heat transfer to the outside of the bottle. A powder coating makes cleaning a breeze. Both the bottle and its lid are dishwasher safe. The bottle comes with a carry handle for drinking on the go. The leak-proof Flex Straw Lid allows for easy drinking with just one hand. Fits most cupholders.
Take your refreshment with you in this insulated Hydro Flask water bottle, powder-coated for an easy grip that's sweat-free and durable. Thanks to the brand's TempShield double-walled, vacuum-insulated technology, it guards the temperature of your drink, keeping beverages cold up to 24 hours and hot up to 12 hours when using the lid. Made with pro-grade stainless steel, a robust metal known for its resistance and purity, the bottle protects against the transfer of flavours, keeping your water pure-tasting. The durable construction ensures no condensation or heat transfer to the outside of the bottle. A powder coating makes cleaning a breeze. Both the bottle and its lid are dishwasher safe. The bottle comes with a carry handle for drinking on the go. The leak-proof Flex Straw Lid allows for easy drinking with just one hand. Fits most cupholders.
Take your refreshment with you in this insulated Hydro Flask water bottle, powder-coated for an easy grip that's sweat-free and durable. Thanks to the brand's TempShield double-walled, vacuum-insulated technology, it guards the temperature of your drink, keeping beverages cold up to 24 hours and hot up to 12 hours when using the lid. Made with pro-grade stainless steel, a robust metal known for its resistance and purity, the bottle protects against the transfer of flavours, keeping your water pure-tasting. The durable construction ensures no condensation or heat transfer to the outside of the bottle. A powder coating makes cleaning a breeze. Both the bottle and its lid are dishwasher safe. The bottle comes with a carry handle for drinking on the go. The leak-proof Flex Straw Lid allows for easy drinking with just one hand. Fits most cupholders.
in 25 offers
The lowest price for Hydro Flask Standard Flex Straw Cap 21oz Black right now is $40.00 at Southern Man Surf Shop, compared across 13 retailers.
The all-time low was $25.50 on 10 Mar 2026 — today's price is 57% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 1 Nov 2026.
Last updated at 01/11/2026 14:07:50
Hydro Flask 21 Oz Standard Flex Straw Cap
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Hydro Flask Hydro 21OZ Standard Mouth With Flex Straw Cap
Delivery between 3–11 Nov $9.95
Hydro Flask 21Oz Standard Mouth Flex Straw Bottle in Purple
Next-day delivery $14.49
21oz (621mL) Standard Mouth Insulated Stainless Steel Drink Bottle
Delivery between 4–12 Nov $10
Hydro Flask 21 OZ (621 ml) Standard Mouth Flex Straw Cap insulated water bottle - Reef
Delivery $39.13
Hydro Flask - Unisex - Standard Flex Straw Cap Water Bottle - Black - Stainless Steel - Os
Delivery $30
Hydration 21 oz Flex Straw Cap, White
Delivery between 4–13 Nov $9.95
21oz Standard Flex Straw Cap Lupine
Delivery $12.50
Hydro Flask Standard Mouth with Flex Straw Cap 21oz/621ml - Trillium (Matching Lid/Body)
Delivery between 4–12 Nov $10
Hydroflask 21 Oz Standard Flex Straw Cap Green
Delivery $9.95
| Volume | 621 mL |
| Mouth Diameter | 1.91" |
| Diameter | 2.87" |
Hydro Flask 21 Oz Standard Flex Straw Cap
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Hydro Flask Hydro 21OZ Standard Mouth With Flex Straw Cap
Delivery between 3–11 Nov $9.95
Hydro Flask 21Oz Standard Mouth Flex Straw Bottle in Purple
Next-day delivery $14.49
21oz (621mL) Standard Mouth Insulated Stainless Steel Drink Bottle
Delivery between 4–12 Nov $10
Hydro Flask 21 OZ (621 ml) Standard Mouth Flex Straw Cap insulated water bottle - Reef
Delivery $39.13
| Volume | 621 mL |
| Mouth Diameter | 1.91" |
| Diameter | 2.87" |