I would suggest keeping a couple of pairs of emergency headphones in your carry-on, laptop bag, and gym bag. These Panasonic ear buds are just $7 today (down from their usual $10) and have a very impressive 4.3 star rating with 51,000 reviews. I don’t think these headphones will have life-changing sound quality, but they’ll definitely work in a pinch and would make great stocking stuffers.