Make one for yourself. Make one for your buddy. Make one for everyone you know.
Caila came up with this super simple tutorial for making a custom tool roll to house whatever tools the task requires: paint brushes, chisels, carving tools, soldering iron...choose your poison. Rather than getting over precise with specific measurements, she shows you how to lay out your tools on the blank and customize the roll to your specific needs.
Get the full how-to (and check out plenty of other cool sewing projects) at CailaMade: Leather Tool Roll DIY