This accordion water bottle consists of polyethylene with a polypropylene lid and a rubber spout. Holding up to 28 oz. when expanded or 16 oz. when collapsed, this bottle showcases a screw-on lid with a drink-through push/pull spout. Measuring 7 1/4″ tall when collapsed and 12 1/2″ tall when expanded, this water bottle has a 3″ diameter and should always be open when expanding and collapsing.