I use color coded "CHUCK-EM's". I have three different charges so I use three colors. I don't like having to read to know what is in the tubes. I have extra time on my hands so I use spent shotgun shells. I cut off most of the plastic of a high brass empty shell and put the base in a fire until all of the plastic has completely burned. It cleans out real easy making the lid. Then I use a low brass shell for the filler tube after I cut of the crimped end. It only takes a few minutes to do several. It is free and it doesn't take long to make a lot and they seem pretty water tight. When in the field load your gun and just chuck em when the chase is on. They are not transparent, so never, every put the lid back on an empty.