Empty hard plastic bottles have an annoying habit of consuming precious pack storage space when you don't need them. That's why Platypus designed bottles like this half-liter Platy Sport with a plastic laminate that flattens and rolls up when you don't need it. A gusseted base allows for free standing convenience in camp and at rest stops. Welded, triple-layer plastic laminate lined with food-grade polyethylene Imparts no taste or odor to liquid contents Self-standing, gusseted base Can be boiled or frozen (great for temporarily storing sauces for backpacking cuisine) Rolls up when not in use Capacity: 19 oz. (0.5 l.) Dimensions: 5 in. x 7.5 in. (13 cm. x 19 cm.) Weight: 0.7 oz. (20 g.)