recommend - own several
I love these bags. I am a marine biologist, and spend a long time hauling my gear around on boats. My whole lab and I love SealLine bags. I use the 10L Kodiak bag as a camera bag for my digital SLR, and another to keep my change of clothes dry. Love that you can push the air out of these through the window - makes it a lot easier to fit this into another pack. I have used it as a solo bag for my camera on boat trips (often in the rain and treated very roughly) 4 times a month for the past 3 years, and have never had any problems with it.
re: other reviews about leak problems - this has NEVER ever been a problem for me, and I've taken this bag out on the boat in heavy rain, and even let it slosh around in the water on a dive boat. But, if you're worried, SealLine offers lots of other options without the valve.