I have the UTG covert 32-inch bag.
right now it's loaded up with a M&P15, M&P15-22, 3 30-round (223) mags , 1 10-round (223), 3 25-round (22lr) mags, 3 12-round (40S&W) mags, and my aimpoint clone.
it may be made for airsoft, but there hasn't been any signs of failure carrying it around. the only downside to it with 2 rifles in there is that the grips rest on the other rifle's barrel. They are in 6-9 position.
i got it here for $33.50 shipped:
http://www.amazon.com/UTG-Covert-Ho...e=UTF8&s=sporting-goods&qid=1263395996&sr=8-4
Here is the bag the day it arrived (2 days after I placed my order I might add with amazon prime):
Here are some pics from the packaging material around the bag...I haven't taken any shots of it loaded up.
EDIT: before any flames arise, or the issue is brought up, I keep it in a low humidity place with those moisture silica capturing stuff.
and if anyone asks when I am carrying it, I tell them it's a keyboard, but I don't feel comfortable playing it in front of people. Maybe next time.
EDIT #2: I cannot place two rifles in here with my aimpoint clone mounted.
EDIT #3: It doesn't have a lot of padding.