EDIT: Although the friction of the hinge was sufficient for a short while, somewhat as expected, the hinge has gone limp. A new version with some sort of latch is in the works. Just a place to put some writing things. My new backpack doesn't have a good place for pens and pencils, so I figured I would just make something to put them in instead of letting them swim around the bottom of the pockets. It uses a piece of 1.75mm filament as a hinge It should accommodate almost any writing implement up to a little over 5" long, and 0.5" wide.