Depends on what you are using the roll for. Mine are just heavy fabric for holding wrenches, pliers, and screwdrivers. I picked the material because it was free. But what you are going to put in the roll should be what drives the material choice. Heavy tools, heavy fabric. Your spice kit could be made out of something light and easy to clean. If you need to see what is stuffed in a pocket use clear vinyl for the pocket, my adventure medical first aid kit has this.

If you are thinking of making your own here is a diy gear forum with information on sewing your own stuff,

http://www.diytactical.com/forums/

Don't know much about that forum and there are probably more, but there is good information and suppliers there.

If you make your own be sure to post a few pictures and show off your work.