I don't know if this is pertinent to "load bearing" gear,but Gerber makes 1 or 2 hydro packs in screaming fluorescent green,fire resistant material w/reflective strapping.The 1 I got Only holds about 300 cu.in., but comes with a 70 oz. semi rigid reservoir for either hot/cold fluids which, if needed, could be removed and filled with more gear( just checked-the other unit is strictly hydration). Has anyone else checked these out?