Platypus Platy 2-Liter Ultralight Collapsible Water Bottle Collapsible, ultralight two-liter (70 ounce) water bottle with screw top for camping, day hiking, thru-hikes, backpacking, and travel Weighs just 1.3 ounces, and measures 13.8 x 17.5 inches; collapses and rolls up small enough to fit inside a pocket when empty BPA-free, BPS-free and phthalate-free; food-grade polyethylene lining does not taste like plastic or retain flavors Water bladder has a stable base and stands upright when filled; ideal for toting water and other beverages Accepts Platypus caps and drink tubs; pairs with water filters and can be used with the Platypus GravityWorks water filtration system