The 12 Survivors Reservoir 17: Collapsible Water Bottle is an incredibly lightweight water bottle, collapsible to a very small size. When not in use, this .5L water bottle is extremely easy to pack away and features a cap to keep the mouthpiece clean and sanitary. The bottle boasts an adapter for standard threads and easily attaches to the 12 Survivors Pocket Water Purifier and most standard bottle caps. Completely BPA, PVC and phthalate free, the rugged RF welded seams provide extreme durability for outdoor conditions. Gear loops for hanging on packs and other locations increases the bottle’s versatility.