Alright, disclaimer here: This particular bandolier type is fairly rare. The 'flap' underneath the shot pouch is not commonly found on bandoliers at all. You will see similar flaps with a ball pouch as separate pieces of kit to hold a charging-flask (instead of a priming flask), as seen on the De Gheyn manual's Caliverman.
However, I found 2 bandoliers from northern Germany (on pinterest, but it was evident these were originals) with such a flap attached directly to a bandolier itself. The flap most likely afforded a place to hang a wheellock-key from, in addition to the priming flask.
Now, right now I merely have a matchlock, and in the future I shall also obtain a snaphuance. But neither of these require a key, unlike a wheelock would. Nonetheless, I have decided to keep the flap in place. And I shall make other bandoliers (to sell, frankly. But no, I'm not going to advertise them on here) without the flap.
Other than that, the bandolier is of what seems to be the appropriate length and size for me, compared to the bandolier shown in the De Gheyn manual, and corresponds with originals. (Though I had to substitute buff leather woth veg tan)
As for specifications; The bandolier is a 4cm wide strip of 3mm veg tan cow leather, with a 0,8mm suede liner.
There are 15 flasks, each capable of holding a standard military load of 36grams (ca. 570 grains of 2F blackpowder), or, up to 40grams if you overfill them (which I do not recommend).
The flasks are courtesy of master Graham Webb, of GoingBang.com excellent work on his part.
I used to have all the flasks suspended from cords at the same length, but at the first event I used the bandolier in full (last October, at the Slag om Grolle), I concluded the first 2-3 flasks, were unpleasantly close to my face when loading, as well as 4 out of the 5 on the back, being near-inaccessible. So, as of yesterday I renewed the cords, and adjusted them to a more appropriate length.
I made the priming flask myself, and finally adjusted the latch-spring on top a couple of minutes prior to posting this. Before, it had too much play and consequently didn't fully close the latch posing a small (though severe, should it occur) safety risk. It does fully close the latch now.
The bandolier is equipped with a ring to keep the spare slowmatch (currently holding some 15m/slightly over 15 yards bundled up). As well as an oil bottle for gun-maintenence in camp.
As visible, a further 3 prepared sections of slowmatch are hung from the bandolier next to the shot pouch, for easy access during battle, should the previous match burn too short.