The Hydrapak Stash Collapsible Bottle has been designed to keep you hydrated without weighing you down, this compact, flexible and light-weight water bottle packs down to an incredibly small and stackable size when not in use, perfect for when you don't need unnecessary weight or bulk in your backpack. Simply remove the cap and squeeze to pop open and twist-n-click to close, the narrower mouth of the 1L Hydrapak Stash Bottle is easier to drink and pour from, minimising spills whilst the wide-mouth of the 1L makes it easy to fill and clean. Hydrapak Stash Collapsible Bottle Features Collapsible bottle stashes down to just 2 inches in height Is stackable and therefore nests with other Stash bottles for efficient multi unit storage RF welded to create superior bonds at a molecular level BPA/pVS Free and meets FDA & EU regulations Dishwasher safe Naturally anti-fungal Molded top and bottom