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.

• TempShield double-wall vacuum insulation keeps drinks cold up to 24 hours, hot up to 12
• Flex Cap is leakproof when closed
• Honeycomb Insulated Cap for maximum temperature retention
• Made with 18/8 pro-grade stainless steel for durability, pure taste and no flavor transfer
• Color Last powder coat is durable, sweat-free and colorful