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The Platypus Big Zip reservoirs feature a patented, wide-opening zip closure. This makes it quick and easy to fill them with water, to add ice cubes or drink mixes, and to thoroughly clean and dry. Built with the same flexible, durable, three-layer laminate as Platypus bottles, Big Zip reservoirs likewise have no unpleasant plastic taste. Big Zip reservoirs come in five sizes, and the larger sizes have grommets for attaching carry handles or suspending as a camp shower. All sizes are sold with a closure cap.