The Hydro Flask 21oz Standard Mouth Insulated Bottle with Standard Flex Cap is a sturdy vessel for holding your drink. Fill it up with water and stay hydrated through the work day. The cap Features a loop, so you can grab it by a couple fingers and carry it around with ease. Stainless steel and insulated, so your drink stays cold (or hot). Features of the Hydro Flask 21oz Standard Mouth Insulated Bottle with Standard Flex Cap Smaller convenient size Insulated Flex Cap for easy-carry comfort and ultimate portability Ideal for kids TempShield Protected 18/8 Pro Grade Stainless Steel BPA-Free Durable, sweat-free powder coat finish