For those who need a little
The hydration compatible, M.O.L.L.E. Engagement Pack from Red
Rock is made of Durable 6000 Nylon Pack cloth and comes with a
large main compartment and an two expandable external pockets
(one zippered on the main compartment panel), both external
pockets having detailed dividers and pockets in them.
If this isn't enough room for you to pack your gear, this pack
comes with a detachable M.O.L.L.E. butt pouch