I bought the most amazing black canvas bag in NYC last year - great cotton, so simple, so sturdy, perfect feel, perfect size, no label or brand whatsoever, it was instantly a great classic that I would take everywhere - and it cost something like 30$ !
Since there were no labels, I didn't know where it originated from, and had to send a spy in the shop to scout the info for me during his recent NYC trip- and he successfully found the precious info : Rothco military bags!
The website is not very welcoming, its basically a military surplus provider, but damn, the bags are very nice, including the Air Force crew bag and the duffle bags, mine is the "parachute cargo bag"...