I have a waterproof-ish Simms bag that's a green version of this. It's been in rain, snow, I've literally swam with it above my head to get across a lake to shoot some cliff jumping. It's been through 11 trips to the Caribbean, totaling almost 9 months, and god knows how much time on boats there and on the colorado river. Also been through classIV rapids getting totally soaked. Kept my camera and three primes totally dry as bone through all that, no maintenance for the 8 years I've had it. No idea how much it costs. But highly recommend it for a stupidly lightweight bag. I have zero experience in any other bag, other than a pelican box, but it's not portable like this fucker. Only cons - no padding or rigidity. But if you can skip the last two things, please make me happy and just get this bag even though it's meant for flyfishing I'm pretty sure. The pouches hold lenses just as well as reels. So get this bag already. Pussy.
Okay no but seriously though +k though for not being a pussy and wanting to take your camera rafting. I hate people that leave their shit at home.