Chris got these earlier this year and LOVES them. They're 100% cotton (seems hard to find these days) and come in lots of colors. Especially good for men that are on the taller side.
I know this isn't super sexy, but this was hands the MVP of our trip to Europe this past summer. The 10,000 is enough to fully charge two iPhones. If you know someone who's "phone is always about to die" this is for them.