I've used Fiebing's Leather Cement, applying a thin coat with the edge of a toothpick. It dries clear.
Fiebing's also makes a neutral (clear) Edge Kote that you could use.
Tandy also makes an edge paint product that comes in different colors and finishes (matte or gloss) but I haven't tried it either.
I used the clear Edge Kote with a bit of acrylics added for the colored bags, and it worked fine... I saw many different colors of EK at the Tandy Leather store, but I found it more efficient to just make my own in the amounts that I need.