Used a label maker for a while. Worked great on clearos and cartos. Now i only keep 4 or 5 clearo/tanks loaded and drip any new flavors. The 4 or 5 i keep loaded are color coded. Black evod for my adv, green evod for anise/licorice/absinth flavor, purple evod for what ever fruit vape i am using, stainless evod for my coffee or choc flavor, and a vivi nova metal for what every fruit ice i have loaded (orange/cherry/strawberry/blueberry/pineapple). Everything else gets dripped.