Made of Polypropylene and Silicone material. Collapsible Water Bottles Leakproof Valve Reuseable BPA Free Silicone Foldable Travel Water Bottle for Gym, Camping, Hiking, Travel, Sports. Lightweight Durable 20oz. Widely used in Camping and Travel. 9.63"Hx2.75"Lx2.75"w.