You know, I borrowed the bags (as well as our canoe we used) from my buddy who's pictured with me on that canoe trip... He's the float-trip expert. If I see him sometime soon, I'll ask him. I would think that most anything from Cabela's would be fine, and possibly from Wal-Mart, too (not so trustworthy there, though.)

The ones we used had magnetic strips that locked together and sealed of the inside, then you rolled the top over onto itself several times and buckled it to the body of the bag. It was airtight and watertight for sure.