Leather Belt Bag with Brass Button

Seriously this is a small pouch that you can fit on your belt . I think most people would carry stuff openly in a larger pouch or a haversack-many of which can be found at Townsend's. This is a bit more covert.

You can use it to hold a phone you don't want banging around in a haversack but I think it will find more use to re-enactors who don't have pockets in the coats. It's small enough you can slide it on a waist belt, UNDER, your regimental coat. It slides out of sight of sharp eyed NCO's and you can keep things like spare flints or musket tool there so they can be gotten quickly when needed with little fumbling.

You might even use it to carry extra ammo if you're in a real powder burner like Germantown.