I did the same thing a year ago with a damp rag and a plastic bag. Worked great, or so it thought. The paper wrapping on the package got damp. Then one day the pack in the guitar port was empty. It had sprung a leak. Dried white stuff collected at the bottom inside the guitar body. I gently scrapped out what I could. My luthier and I haven't found any actual damage (yet?) but obviously I don't do this anymore. Gave up the packs and now use a wet spong in a drilled out soap dish. As the house has hot air heat, I do this in the winter.
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