I'm feeling inspired by my hubby's biking gear. Big pockets in the back with elastic on top to "close". It would keep most things from falling out easily but wouldn't require you to take off gloves to zip or snap... Maybe some kind of flap too?? Maybe the waxed cotton would be a good material? My sister used to make art by putting regular hot wax on cloth and then crack it and paint over... Paint wouldn't stick where the wax was... Maybe you can make your own waxed cotton?
