Elite Survival Systems came out with a backpack that can carry a broken down 16" AR. Unlike some other offerings this backpack lacks some telltale signs such as MOLLE webbings.
Inside is made of 500D nylon with velcro loop in the main compartment. There is a quick-access handgun compartment as well. It weighs at 4.375 lbs with dimension of 25" x 12" x 9"
Price is $224.95
http://www.elitesurvival.com/concealment-bags-packs/stealth-covert-operations-rifle-backpack/
From:
Soldier Systems