Hydrapak stash 750 collapsible water bottle 750 ml description compact flexible and lightweight the 750ml stash tm collapsible water bottle keeps you hydrated without weighing you down packing down to roughly the size of a hockey puck the stash allows you to carry multiple bottles without adding unnecessary weight and bulk to a bag or pack simply remove the cap and squeeze to pop open and twist n click to close the narrower mouth is easier to drink and pour from minimizing spills