Erin from Sewbon shares a tutorial at Therm O Web showing how to make a drawstring ditty bag. What can you put in a ditty bag like this? Just about anything! Use it as a project bag, a toiletry case, a toy organizer, anything. She gives the dimensions to make a good sized bag, roughly 8.5″ diameter. You can adjust the dimensions to make them in any size. Go to Therm O Web for the tutorial.
[photo from Sewbon on Therm O Web]