Huge access screw-down port makes filling and cleaning very easy. This hydration delivery system fits all of Fishpond specified packs and is a hands-free way to stay active. •Anti-Microbial polyurethane material •Heavy duty RF welded construction for unmatched reliability •Taste free, odor free and UV stable design •Microwave safe and freezer safe •FDA approved 35 oz. (1L) - 52 oz. (1.5L) - 100 oz. (3.0L) Vendor: Fishpond