Double wall stainless steel vacuum construction with copper insulation, which allows beverages to stay cold for 24 hours or hot for at least 8 hours. The construction also prevents condensation on the outside of the bottle. Screw on leak proof lid with magnetic carry handle that keeps cap stowed while drinking. Ergonomic drink interface that delivers a high flow of water without sloshing or spilling. Wide mouth opening for easy cleaning and filling. On trend, durable powder coating. Volume capacity is 600ml. Lifetime guarantee for manufacturing defects with Got Your Bak.