Great idea. Also, look in the craft stores for the coin tubes that have pressure fit caps. They may be cheaper. They may be in the bead area. Here is the link to the pictures of the "tube EDC" kit in the Photo Gallery I made:
http://forums.equipped.org/ubbthreads.php?ubb=showgallery&Number=131209#comments They may be a bit longer. They are made of different material, so the impact-resistance may suffer a bit.
My $.02