FlexWear 500ml/17 Ounce Double Walled Vacuum Insulated Stainless Steel Water Bottle for Hot or Cold Drinks, BPA Free, Hydration Bottle Sleek cola bottle design, both compact and convenient. 10.1 Double walled stainless steel construction with vacuum-sealed cap providing long lasting insulation for both hot and cold drinks. Hot drinks stay hot for 12 hours, cold drinks stay cold for 24 hours. Double walled design also ensures no sweating or condensation. Perfectly suited for storage in your purse, gym bag, or book bag with no damp mess. Crafted from 18-8 food grade stainless steel and, unlike plastic water bottles, contains absolutely no hazardous BPAs whatsoever. Each of our water bottles is built to last a lifetime and is covered by the Flexwear Lifetime Guarantee.