I want to make one.

I seriously need to make one of these. Do you know how handy this would be for musicians? Yeah. If I ever get around to making one, I'll post a tutorial. I just think these are awesome.
I do this a lot... I find something I like on the Internet and go, hey I could make that. So I have all these ideas and if I made them all, I'd go bankrupt. :P
(In case you can't tell what it is, it's basically a pocket on a bracelet that you can put money or car keys or other little things in. Ingenious.)