Built for duty. The Endurance Bottle Military Edition is a 25oz insulated stainless steel water bottle in officially licensed branch designs — Army, Air Force, Americana, and OCP Camo. Interior 18-8 SS with exterior 201 SS, double-wall vacuum insulation, and a twist-on lid with screw cap and carry loop — splash-proof and leak-proof so you can toss it in a pack and head out. BPA-free for endless refills, on duty or off.