I built one once, several years ago, like your M&Ms tube on steroids. Used a 24" long, 2" OD PVC pipe, fitted with an screw-on plug at one end and a fixed plug on the other. Epoxied on paracord loops to clip an old rifle sling to, and wore it across my back. <br><br>Useful in some ways- big enough to carry a sven saw blade and 4" folder, a pair of match cases, etc. But also heavy, and bulky. I eventually disassembled it, but it really wasn't a bad kit. I've been thinking about rebuilding it. <br><br>Any one done anything similiar? I'm thinking acutally about two, 16" tubes, and making a "tactical holster"-type carrier for it.