Keep life moving with the 21 oz Standard Mouth Bottle with Flex Cap. It stashes easily into a small shoulder bag, your packs side pocket, or your car cup holder, and holds enough ice-cold goodness to keep you going for hours without weighing you down. No wonder it's one of Hydro Flasks bestselling water bottles! TempShield insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours. Versatile, middle-of-the-road size. Durable 18/8 Pro-Grade Stainless Steel construction. BPA-Free and Phthalate-Free. Compatible with Standard Mouth Insulated Sport Cap. Lifetime Warranty.