What is your favorite travel item that you couldn't live without, big or small? I'm trying to come up with Xmas presents for several frequent travelers (and give family members suggestions for myself

). For example, a piece of luggage or a favorite travel pillow.
My favorite piece of luggage is my Andiamo 18" five-pocket tote. Absolutely perfect bag for an overnight trip -- fits a set of clothes/pajamas, my computer, a bunch of files, a book, my toiletries, and even my Bose headphones with no problem. And the best part is that it fits under every airplane seat, even those hopper planes, so I never have to worry about overhead bin space.
So what do you love? Again, big or small.