I always drag my Copic markers around every where I go. I wanted to be able to see at a glance which markers are mine. I tried washi tape but found that I needed to put scotch tape over it to keep it from peeling off. I ended up using K&Company Smash Clear Tape Whale Dispenser to label my markers - problem solved. The tape stays on and the colour coordinates with my craft studio and other tools.
My next dragon to slay is ordering another 72 slot wallet to house my ever growing collection of Copics.