Maybe better than towelettes and more like the original alcohol idea are the prepackaged alcohol swabs (tiny squares of gauze premoistened with rubbing alcohol for use in sterilizing the skin site for giving injections). They come in foil pouches about 1.5 inches square and are sold by the 100 at pharmacies. A couple of these would go along in your tool bag essentially unnoticed. But whichever of these you choose, it is also nice to have them along on a ride in the event of a crash and a case of road rash. Good to clean up the wound and sanitize it.