I'm fairly certain that I'm not the only one using a label maker to identify different flavors in cartomizers. The model that I use is a Brother P-Touch PT 2430 PC. It uses various widths of laminated vinyl adhesive labels which aren't damaged by eliquid. They're handy for labeling DIY bottles as well. The labels that I chose are 1/2" gold on black, and look pretty classy on a Leo.



