"A compact .5-liter hydration solution that's easy to bring along on outdoor adventurers, the HydraPak Stow 500mL Hydration Bag offers ultralight water storage for outdoor fun. Made of a lightweight TPU, this soft-side water bag features a slim profile that makes it easier to hold and easier to slip into a pocket or tight spaces in a backpack. This collapsible design folds or rolls up compactly for easy packing in its included storage bag. The ultra-durable, abrasion-resistant water bladder from HydraPak features RF welded seams for superior durability and elasticity. Built for on-the-go drinking, this bag features an easy-open flip cap cover over a spillproof, self-sealing silicone nozzle and a bail handle for easy carrying and handling. Designed to work with most 28mm threaded water filters. 6.8""L x 4""W. 1.6 oz.Manufacturer model #: GS335. Versatile hydration solution for outdoor adventures Compact soft-side water bag fits easily in a pocket or tightly packed backpack .5-liter capacity Ultra-durable, abrasion-resistant TPU bag with RF welded seams Easy-open flip cap cover over a spillproof, self-sealing silicone nozzle Works with 28mm threaded water filters Handy bail handle"