I eventually got my possibles bag down to powder, projectile and nipple wrench when I shot a sidelock.
Now I'm down to powder and projectile and I carry a capper on a yoyo string around my neck. I'm using Power Belt bullets for my Savage so I don't need a short starter.
So around iowa I don't carry a possibles bag anymore; I have a hunting jacket with 6 pockets. One has premeasured powder charges (I carry them in transport tubes, available from medical supply houses), one has power belt bullets. The capper is around my neck, still on the yoyo string.
When I went to Colorado with my 10ML I used a small fanny pack with three compartments. Powder charges, bullets, and the big, middle compartment with some disposable alcohol swabs and stuff that has no business in a possibles bag: a lighter, some dental floss, a space blanket and a granola bar.
That's just the way I do it.