The Hydro Flask 24 oz Standard Mouth Bottle with Flex Straw Cap is just the right size for staying hydrated before, during and after activity. This bottle features a Flex Straw Cap that is leakproof when closed, so you can transport it without worry. Its TempShield double-wall vacuum insulation keeps beverages cold up to 24 hours and hot up to 12 hours. Get more hydration for more fun with the leakproof Hydro Flask 24 oz Standard Mouth Bottle with Flex Straw Cap!