Great quality, really big if that's what your after - 5.11 Tactical Rush Delivery Xray Carry Bag

I bought this for work to hold my laptop & other misc junk that I have to haul around. The quality is excellent and the price was even better. This thing is ginormous, you can hold a bunch of stuff, being as they come in three sizes, I recommend you pick the right size. Even though I love this one, i could have went a size down and still fit all my needs. Extra large shoulder strap works great, plus a waist strap for added positioning, vertical sleeve pockets all over. I don't use it for carrying a firearm so I can't comment on that. As a messenger bag it's fantastic.