The WorkSack for Combat Controllers or JTACs. 'Nuf said.
From a Mk 20 to a Mk 13, the 40 Sniper Pack discretely carries both your weapon system and basic kit for an extended jaunt in the hills.
The 26Z Alpine Team WorkSack carries your summit gear for fast military mountaineering climbs or slow slogs.
White Load Hauler for Winter Mountain Warfare & Far North