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Some of the weight increase also comes from the wood that gets saturated between the hulls. Also it seems the foam holds the water within itself not so much un a pool. My deck cover had to be over 200 pounds, maybe more, and it was all wet. Although no delaminating, the transom wood was wet all the way up. Who knows how much that all adds up to. I bagged mine after disassembly and probably took few gallons out with the dehumidifier. Seal it up and go!