Safe transport in a bag or backpack, no leaks - neither upside down nor in a horizontal position. Leak-proof even with carbonated beverages. Keeps drinks hot for up to 10 hours (at 1.0 L) and cold for up to 72 hours (at 1.0 L). Vacuum-insulated, copper-coated double-wall construction. Made from 90% post-consumer recycled stainless steel. By using 90% PCR stainless steel material, the CO2 footprint of the Shield Therm One bottles is reduced by 23% compared to using similar products made from primary materials.