My possibles bag holds a handmade leather container with 20 roundballs, a small brass flask that hold enough powder for about 10 shots, my brass priming powder dispenser, a leather wallet holding extra flints, a short starter, a piece of solid brass for knapping flints, a small tin of patches, a film container holding three lubed cotton balls for emergency firestarting, my powder measure is attached to my strap with a piece of leather as well as a paper clip that serves as a means for clearing my touch hole.
All in all, this a pretty light weight bag that holds all I need. If I want to carry food, coffee, etc, I carry a second bag.
Jeff