When I lived in Asheville I worked for Brevard Electric Co.The job I was on for over 2 years was at Sonopress which made cd's.Some of the trailors at the loading docks must have also been used by soft drink companies,because you could find the thingies that were blown into plastic coke bottles.I found 'em in two sizes,the bigger ones were about 5" long and about the same dia. as the opening of a standard coke bottle.The top was already threaded to fit a coke bottle screw top,and had the ridge that is right under it.All you had to do was put a coke bottle screw cap on it and it made a great waterproof, crushproof,place to put stuff in.I lost all the ones I had when I moved.Has anyone here ever used these things,or know where to find them?