This is one of those "where have you been all my life" buys that I will forever be glad I made. I carry keys and a phone (and sometimes an ATM card and pepper spray) when I go running and I don't like backpacks or arm bands or those weird side pockets they're putting on leggins these days. I usually don't like things around my waist either but this is a wonderful exception.

Even with my phone and keys tucked inside, you can barely notice it under my clothes. I wear it for running but I would use this for travel as well. A good way to hide your money from pickpockets in a way that is so comfortable you forget it's there. It also reacts to moisture well, so it doesn't get uncomfortable when you're sweating. I like the way it stays put so that nothing jiggles when you're running.

I recommend getting a size smaller than you think, because it stretches out after a while, especially if you put big things in it like phones.