Hydrapak's new snap together bottle, the Collapsible Stash Bottle, is a unique take on the space saver approach to bottle design. When not in use a bottle just takes up room. Hydrapak’s Collapsible Stash has a specially designed “top and bottom that snaps together for easy storage and transport.” The bottle’s walls are made from soft TPU. All construction materials are BPA & PVC free, dishwasher safe and anti-fungal. The bottle comes with a No-Leak product lifetime warranty and the cap has a useful carry loop.