Powder flasks were normally carried with the spout up as the flask had metal loops on the side to allow a strap to hold it in position. Shot flasks usually had a metal loop at the bottom which allowed the flask to be carried upside down. This kept the weight of the shot on the strongest area of the flask rather than on the on the weakest which is the stitching around the bottom of the flask. It also allowed the shot to flow to the chargers. In the above flask, as the charger scoop (dispenser) is pulled out, a spring-loaded shutoff valve closes off to keep any shot from falling out. When inserted, the end of the charger scoop opens the valve to refill the charger scoop. Simple but effective. The main problem with this type of dispenser is that the removable charger scoop is lost at some point. If you see these for sale, a lot of them will not have the scoop. The size of the above flask is roughly 8" by 4".