Look to the side of the road in countless countries, and you’ll see disposable plastic dead soldiers everywhere, adding to the litter problem. Next time, bring along the Hydrapak Stash, a soft TPU-walled bottle with a molded top and bottom that snaps together in a 2-inch-high package for easy storage and transport. The BPA- and PVC-free bottle packs into a size that barely takes room in your carry-on, and the molded bottom allows it to be set on a table without collapsing.