Stainless steel, insulated, reusable, and sized for epic days - our 40 oz Wide Mouth water bottle is the flask to grab to keep cold drinks cold and hot ones hot. The large opening makes it easy to add ice - and get yourself a bigger gulp. Fill up for adventure. 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. Wide Mouth opening is ice-cube friendly. Bottle fits most backcountry water filters. BPA-Free. Dishwasher safe. Not for use on a stove, in a microwave or freezer.