I have a small one that I use for my camera, GPS, and other whatnot I want to keep dry when canoeing.

Works great. Had it for 3 years, been to the boundary waters a few times and holding up well.

I also have several larger Seal-Line brand bags for canoe trips - even a couple massive duluth pack style bags. I don't understand why folks still use (or I should say, buy them now - using what you already have I can understand) the old fashioned bags when a brand new dry bag is under $100 for approx 5,000 cubic inches.