Like any true wingman, this pocket supports your weekend exploits by making hydration a top priority. Designed to fit most water bottles up to 750ml, it pairs a nifty elastic cord with a cordlock system that offers easy one-handed access so you can accomplish your mission single-handedly (as it were). The WINGMAN HYDRO is compatible with most backpacks so it can meet a wide variety of libation priorities - ranging from keeping extra H2O on hand for long in-and-outers to holstering a cold one during an afternoon of fishing