For a variety of reasons, most hotels don’t supply toothpaste in rooms. (Here’s an article from Slate that explains why.) And you can’t take a standard-sized tube in carry-on luggage because the toothpaste police at the airport will confiscate it. I stock up on 12 packs of 0.85-ounce tubes of Crest. — MF

This small $15 electric razor from Philips Norelco uses 2 AA batteries. I bring it with me when I travel and have started using it at home too, because it works so well. — MF