I found the perfect solution for my problem! Thanks to Raspy who hit the nail on the head. I went with the below pictured 5.75" x 3.25" Hefty Ez foil, loaf pan. Wich weighs in at 1/2 oz a peice, I carry two. And at less than 2 bucks for a pack of 5, they are disposable.

I put a few power bars inside them to help them keep their shape, and it protects the power bars <img src="/images/graemlins/cool.gif" alt="" /> .