I made a crayon carrier a few years ago for my nephew's birthday. I used Pirate-y fabrics, since it was, and still is, his favorite, sewed together the squares and folded up about a third of it to make a pocket on the inside. I sewed the pocket into crayon sized sections and added crayons.
I added a ribbon to the outside to hold it shut.
Roll it up, tie it off, and you have a portable crayon holder. Voila.