Hydro Flask, 21 Ounce Standard Mouth Flex Cap

Standard Mouth 1.81" opening fits the Hydro Flask Sport Cap and Standard Mouth Flex Cap With its double-wall vacuum insulated TempShield technology, liquids remain hot up to 6 Hours, and cold up to 24 Hours All Hydro Flasks are made of non-toxic BPA-free plastics & 18/8 stainless steel food-grade stainless steel Thanks to the proprietary powder coat, your bottle stays slip-free making it easy to go wherever you do Fits in most automobile cup holders and bicycle bottle racks