For me I just know what line is on what type of rod after so many years of experimenting. The closest thing I come to labeling is the color coded rod sleeves like in A-Jay's pic. Black is jig, black/red is t-rig, red is spinnerbait, blue is crankbait, yellow is spinning w/8-10lb line, and the purple is for the two sissy ML 6lb spinning rods. This makes things easy to figure out but I need to buy some more sleeves as some were lost after my last tournament.
Allen