Hydro Flask's 32os leakproof Flex Straw Cap—easy to fill, easy to drink. Open it up, add your ice, and flip to sip. TempShield® double-wall vacuum insulation keeps drinks cold up to 24 hours. Insulated Flex Straw Cap is leakproof when closed. Made with 18/8 pro-grade stainless steel for durability, pure taste and no flavor transfer. Wide Mouth opening is ice-cube friendly. Color Last™ powder coat stays clean and bright. BPA-Free. Big enough for a whole day on the river or trails Flex Straw Cap not intended for use with hot liquids. 32oz. Hand Wash Only.