It passes with flying colors. I toobed the Guadalupe this weekend and brought mine along. Even kept my lighter dry. About 4 hours in I got dumped off of my toob, ended up upside down underwater, took a rock in the kidney, lost one of my shoes, the cigar I was smoking, a Bud Light, and my box. Once I re-collected myself my shoe and box miraculously floated past me. I opened it up and everything was dry as whistle. Got back on and lit up. This is one of those few products that actually does what it is supposed to. But damn my back still hurts.