The Blackhawk S.T.R.I.K.E. Cyclone 100oz Hydration Pack (Black) is a 100 ounce hydration pack that has rapidly become a favorite with Blackhawk customers. The Blackhawk HydraStorm Cyclone Water Pack is versatile and rugged, with a drink system that's protected by Microban antimicrobial technology. The water backpack features a bite valve and quick disconnect system for ease of access and loading/unloading. Twin compartments give you extra storage and the large main compartment of the Blackhawk HydraStorm Cyclone Pack has an internal pouch for radio packs and features 3 antenna ports with flaps.