I have a couple of pills that I need to take mid-day, and I also like to carry some emergency cash. In the past I used aluminum containers on my keychain to hold these things, but as my keys were getting unwieldy, I decided to design some simple boxes that fit in my Keysmart keychain. The cash box is the right size to hold three US bills folded in 16ths. The pill box holds two moderate size pills. The lid is designed to slide over the box and has a stop so it only slides one way. I hope you like my design and find it useful!