Both of these pouches are dated to the late 18th century/early 19th century, though the one on the right is almost a classic shape homemade pouch and would be great for your earlier period gear, if you would like to go that way.
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Original homemade pouches of the plainer sort were often made from one length of leather with the bottom third folded up and sewn to form the bag, or began as an "L" shape with the short leg of the leather folded back over the bottom of the long leg and sewn to form the bag. In both cases, only two lines of stitching were required to sew the bag shut either on the sides as in the first example or the bottom and one side in the "L" shape leather piece.
This pouch was also made from a "Hair On" hide, which they believed better protected the contents from rain and snow. Now this feature was not on every plain pouch, though.
The leather strap on this pouch looks like it was made from a piece of cowhide. It also may have had a woven strap of some kind, if the leather to make the strap was not available. Anyone could make a simple loom to make their own strap, as documented in the quote below.
"Joseph Doddridge in his "Notes on the settlement and Indian wars of the western parts of Virginia and Pennsylvania, from 1763 to 1783" talks about as a young lad, he made some good spare money by using a simple loom made from a board to weave many belt sashes and knee sashes [garters] for use with leggings and then sold/traded them to others."
The flap on this pouch looks like the maker may have done some cutting to shape the bottom of the flap, but often on homemade pouches, they just left the leather in the rough or natural condition it came. However, a rough bottom flap did not automatically mean a homemade pouch as another original and possibly professional pouch below had such a rough end flap.
The flap on the next pouch below is rather rough, though it seems to have been made by a professional.
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The banding around the seams and the quality of the stitching on the above pouch, shows at least some leatherworking training of the maker.
Gus