This Zenergy Stainless Steel 500mls water bottle will keep a beverage cold for 24 hours or hot for 12. Made from BPA-free, double-walled stainless steel. A vacuum seal keeps liquids and carbonation fresh. Packaged in a cardboard tube for easy gifting. Imitating the charm of raw materials and natural fibers that can be found in the world’s most picturesque forests, the Wood Collection, featured in a smooth matte finish, resembles mixed distressed woods. High-Grade 18/8 Stainless Steel. BPA-free. Double-Walled for maximum insulation, leaving no condensation on the exterior.