A simple square or rectangle bag in the 6" x 6" or 7" x 7" range, made of 3 to 5 oz. leather or heavy grain sack, is always right for ANY time period.
With or without a flap, simple and PLAIN was always in style.
Simple 1/2 to 3/4" strap with or without a buckle
Leather = calf, pig, goat, deer, groundhog.......... Just about any varmet with leather. thick enough to last.
THINK Simple..........
Ernie