Not being a back packer, nor a KX1 owner, I don't know whether this is practical or not, it is just an idea...Zip-Lock and, I think, Rubbermaid make a variety of refrigerator storage containers with waterproof snap on lids...My XYL has a stack of them that measure 2.5" x 4.5" x 6.0"...Cheap!!!...4 of them for a couple of bucks... Jerry, wa2dkg