Carry-on size only; too small [SEP] These are very, very small. They hold very little--even less than the TSA's carry-on limit of 3.4 oz. Unless you are absolutely planning on carry-on only, get something larger for your check-on luggage. The spray bottle, for instance, wouldn't hold more than a couple day's worth of hairspray. If you're a frequent traveler, you'll spend more time filling these than traveling.