My handwriting is sloppy, so I prepare them on the computer and print them on 1/2" X 1 3/4" Avery 5267 label sheets (80 labels per sheet). I include PG and/or VG base and nicotine level ... and, since I have an obsessive streak, I color code the print font. Actually that does help me identify which is which at a glance.
They wind up looking something like this:
I've learned (from the school of hard knocks
) to cover the label with scotch tape so the text doesn't smear from
juice leakage.