It depends on what your goals/wants are. If you are just going to go shoot a ML and want something that works, a Shampoo bottle with hold/carry your powder, as Canada1812 said, empty cartridge cases make great powder measures, in fact, for hunting and quick followup loads, you can preload several cases with powder and put a cork in them then you just have to pull the cork and dump the powder in and you don't need anything to carry extra powder around, just a half dozen "pre-loads" in cases. You can carry everything in a fanny pack or an old purse. If you are looking for quality "traditional" accoutrements, you are best to make them yourself. You can but all that stuff from the above mentioned vendors but it is all "tourist trade" quality. There are, however, custom makers of horns and possibles bags that make Wonderfull, high quality accoutrements but, like everything else custom made properly, they are not cheap. All depends on what your end goals are. BTW, unlike smokeless powder, Black powder is measured by volume not weight so if you are going to make yourself some fixed powder measures out of CF cases, work up your load with an adjustable measure and when you find a load that works in your gun, make the fixed measure to match the volume of the adjustable measure.