Hydrapak Stash Water Bottle, Smoke, 1.0 L Improved design for easy opening. Simply squeeze to open, remove cap, and fill. Collapasible: 2.25in Closed Light Weight: 93g / 3.2oz Material: .04mm Thin TPU with RF welded seams No-Leak 2 Yr Warranty Molded top and bottom with custom snap-fit storage feature. RF welded seams to create superior bonds at a molecular level. Easy to fill wide-mouth design. Made from BPA-free thermoplastic urethane. Collapses to 4 inch (100mm) height.