Available in 3 litre and 4 litre sizes, the H2Pro Frame Bag is designed to store bulky items within the bike frame without altering the bike’s center of gravity or handling characteristics. Constructed with our all-new H2Tex three-layer waterproof fabric and a high-quality water and dust proof zipper, the H2Pro frame bag features a hidden port that allows you discrete access to the bag for charging batteries or connecting to a hydration bag.