I have aquired 5 different juices and have decided to only use 1 carto for each juice at a time as I filled 5 with the 1st juice I bought only to have to throw them away because after the juice steeped it was the worst thing on earth LOL Now I am using little colored rubber bands on the cartos and it is driving me crazy. I would like to have different juices loded in several cartos when away from home but cant tell the cartos apart without the annoying little rubber bands on them. I remember seeing colored caps on one of the million sites I have been on but can't find them now. Also someone mentioned boiling cartos. Is this a good way to clean them/ I dont want to do drip tips cause I just want to fill a bunch and be done with it. No holding a bottle all the time.