Hydrapak Stash Water Bottle, 750 ml Collapses to 2 inch (53mm) height. Stackable  Nests with other Stash Bottles for efficient multi unit storage. RF welded to create superior bonds at a molecular level. BPA Free/ PVC Free/ Meets or exceeds FDA & EU regulations, Dishwasher safe, Naturally anti-fungal. Molded top and bottom with custom snap-fit storage feature.