Fox Oasis Hydration Pack: Hydrapak brand 68 oz (2L) reservoir. Detachable hose and slide-top opening allows for easy cleaning and filling. Large main storage compartment. Sunglass pouch and MP3 sleeve. Cinch down straps and mesh outer section designed to fit a Flux helmet can be expanded to fit a full face helmet as well. Bottom shock cord lock system designed to fit armor.