The Hydro Flask 21 Oz Standard Mouth, with the Standard Flex Cap, offers a capacity of around 620 ml and keeps your drinks hot for up to 12 hours and cold for 24 hours. Of course, every Hydro Flask bottle is made BPA- and phthalate-free, while the robust stainless steel construction ensures durability.

FeaturesWater bottle by Hydro FlaskVersatile, middle-of-the-road sizeTempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hoursDurable 18/8 Pro-Grade Stainless Steel constructionBPA-Free and Phthalate-FreeCompatible with Standard Mouth Insulated Sport CapLifetime WarrantyVolume: 621 mLMouth Diameter 1.91″ / 5 cmDiameter 2.87″ / 7 cmHeight 9.4″ / 24 cmWeight 11.3 oz 320 g