Between my wife and I we vape about 5 go-to flavors andabout 20 are in our repertoire that we regularly use. To keep track and not to cross contaminatethe attys and tanks I invested in 25 LR attys and tanks. We use one atty and one tank for eachflavor. When not in use we keep thatatty/tank pair sealed in a snack-sized ziplock bag labeled with the flavor. This method has worked great and has kept themess to a minimum, not to mention the accidental crossing of flavors. Every now and then I clean my attys and tanks out. I also clean out the atty bodies.