I carry the loaded rifle, five spare powder charges in 35mm film containers, 10 spare roundball (why it happens who knows, but I always drop one. My friends claim I am planting lead trees) or conical bullets depending on what I am hunting with, two rolls of pillow tick patch, a old cap tin of bullet lube, my moose milk spritzer bottle, a small spritzer bottle of denatured alcohol, some cleaning patches, all the tools needed to tear the gun down, a spare nipple, and I fill my Ted Cash capper (about 75 caps give or take) and carry the remaining extra spare caps in the tin in my pants pocket in case one or the other is lost.
After season is over I usually have all the same stuff still in my zippered fanny pack which also carries all the other needed stuff to hunt for the day....