Standard Mouth 1.81 inch 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.
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