I like the canvas Bowery very much. I don't find it heavy. It's the bag I use when I'm shooting bands in clubs. I usually go with an M9 with lens attached, and one extra lens. I also have my GR with me, but in a belt case. The ONA's size is good for those situations, because I can move around easily without my bag bumping into people. I like the fact it can be secured. And I like that it doesn't have Velcro.
Jerevan raises an interesting point though. After I adjusted the strap (not the shoulder strap), the bottom part fell off. I hadn't even noticed till a musician packing up saw it on the floor. It happened again a few shows later. After that I wound gaffer tape around the strap, holding the two parts together. It's been fine since then.
The back pocket is pretty useless too. It's too shallow, and I lost a CD a band had given me on the way home when it fell out.
I use one of the external end pockets for an extra Leica battery. I also like the two pockets in the front, and the fact they are protected when the clasp is closed. In one, I keep my extra GR battery, a small notebook (not a notebook computer🙂 ) and some Moo cards. In the other, earplugs in a case and a cleaning cloth.
It basically has replaced my BBB-E and my Barebones Stealth (which I keep forgetting I own, but like when I use it, provided I don't have a heavy lens with me like the Canon 85 F2). The BBB-E is deeper than I need (except for CDs), but it does have the zippered back pocket, and I've managed to shove some merch in it. The BBB-E is also better in the rain.
I have no regrets about getting the Bowery.