Musketeer wearing a bandolier.
Note how he pours the charge from one cylinder down the muzzle.
From De Gheyn.

There were several ways of carrying this ammunition. The powder was normally either in a flask or bandolier; the shot in a soft leather pouch. When going into action, a soldier often took his bullets from his pouch and put them in his mouth so he could spit them into the barrel of his gun and save time in loading.