A rolled up $100 bill can be put in there. A cotton wad soaked in vaseline, a match and a striker pad wrapped in plastic wrap separate from the wad can all be stuffed in together. Half a load of powder for my 50 cal muzzleloader can fit. 28 .177 cal bbs will fit. 5 feet of standard duct tape in a roll will fit. 8 ibuprofren tablets will fit. A black cat firecracker and 1/2 oz of #9 lead shot will fit in there (personnel deterrent???).
One whole sheet of standard kleenex tissue can be stuffed in.

I could go on...