Review on The Versatile OPSAK: Your Solution for Secure and Odor-Proof Storage by Jennifer Dunn

These are great but I find them a little pricey for the actual amount of time you get to reuse them. They will hold if you're very careful, but the plastic, which is quite thick and durable, tends to wrinkle and dent. They seal well and lock well if you open them very carefully. The top will eventually crack no matter how careful you are. I was able to use them for two, maybe three rides depending on what's in there. Again, it's good to have odor blocking and waterproofing, but they don't last as long. The corners are hard and can puncture things, but I use a fairly thick kibble bag so that's not a problem.