The 21oz Standard Flexcap from Hydro Flask Keep life moving with Hydro Flask's 21 oz bottle and Standard Flex Cap. It stashes easily into backpacks, cup holders, and even holds enough ice-cold goodness to keep you going for hours without weighing you down. This black bottle features: -Versatile, middle-of-the-road size -TempShield insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours -Durable 18/8 Pro-Grade Stainless Steel construction -BPA-Free and Phthalate-Free -Compatible with Standard Mouth Insulated Sport Cap Diameter 2.85" Height 11.1" 21OZ/621ML Capacity