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Alpha has a travel tip after learning things for the hard way and ruining some of his stuff (a little alcohol bleached his favorite tan monk straps) while traveling. Aaron Marino of alpha m. says not to toss everything in your dopp kit and then throw into your suitcase.
Items can break and leak into the dopp kit which is not waterproof. One trick is to use plastic baggies. Individually package each into its separate bag. Then stick all bagged items into the center of the suitcase.