Zuma Double Wall Vacuum Insulated 18/8 stainless steel bottle, is more than just a water bottle. This 37 ounce (1100 ml) insulated container is constructed from 304 food grade stainless steel to prevent rust. The vacuum insulation and double wall construction allow exceptional thermal performance with hot liquids staying hot for up to 12 hours and cold liquids for up to 20 hours. The canister will not sweat. Wide mouth opening is "easy pour" "easy fill" with the removable integrated basket to hold ice in when pouring or can double as a strainer when needed. Cap is secured to vacuum bottle by the vinyl strap. Due to advances in manufacturing our bottle is now 30% lighter. Take your adventure Alpine with our Zuma insulated thermos bottle. Built to perform, take a beating and save you money!