Love my discrete cc bag - Vertx Commuter Sling 2.0 Backpack

I purchased this bag to be my computer bag (for a 17" laptop and accessories). Because it is designed for CC, I decided to build a backpack gun to fit it. I can say with certainty that an AR pistol/SBR with an overall length of 20" (or 20" folded) will fit in this bag. A folding stock/brace may make it a bit awkward to fit other things in the bag, but if that's all you're carrying, then it will work fine. I have a .300 BLK AR at 20.5" OAL that fits in here perfectly (with optics, sights, sling and with a 30rd magazine inserted). I have also attached a velcro holster inside the front pocket to carry a full frame 9mm pistol. This still leaves the entire middle pocket open for extra mags, snacks, FAK or whatever. When I use it as my computer bag, it's too full for the AR to fit, but the 9mm is still an easy access from that front pocket. It is a very well designed and rugged bag. I've been using it for a while and there are no signs of it falling apart. It looks used now and even less like a CC bag. I love it.