Apologies if this question is somewhat off-topic (it seems marginally-related to computer hardware based on the FAQ, but I didn't see a more appropriate Stack Exchange forum).
I'm looking for plastic covers that slip onto 2-prong AC power cords and adapters, so that the metal prongs don't poke holes into carrying bags or whatnot during transport. I know that such things exist, since one was included with the AC adapter of my DSL modem (thus I have one -- but I want a few more). However, I can't figure out what terms to use to search for such an item. Any ideas?