uscanteen is made of state-of-the-art double walled stainless-steel that keeps up to 22 ounces of water cool and crisp for 8-12 hours. On cold days, uscanteens will keep your drink warm for 8-12 hours also. Our canteens are [100%] recyclable and contain [40%} recycle materials. Smaller and lighter than the US Army issue M-1910 canteen they are modeled after, uscanteens have a clean oval shape that contours to your body and come in two finishes, polished and matte.