Check out these BPA-free collapsible water bottles! We have all sizes, 350ml, 500ml and 750ml depending on your hydration needs! The bite valve has a twist shut-off with an optional dust cover! All bottles are dishwasher safe (top rack) and freezer safe! We also have collapsible gel flasks and hydration reservoirs that are reversible for easy cleaning and drying! The collapsible feature is awesome, as you drink the bottle becomes smaller for carrying on long runs & rides and adventures, or just stash it in your bag for the day and it doesn’t take any room up!