Jon,
www.eagleindustries.com makes two cases that sound similar to the parachutists weapon case. They both hold your rifle and let you unzipper them to let you lay down on a padded mat. The more expensive one ($160.00) as loops inside to hold your rifle. It holds ammo, cleaning rod, and has a detachable knee pad. It also has padded straps to carry like a backpack. Worth checking out.