A 4 fluid ounce jam-jar will hold an ounces (by weight) of compressed tobacco, an 8 fl. oz. jar will hold 2 oz. B.W. of compressed tobacco, and so on. Should you decide to go this route, a canning funnel comes in very handy and a scale.
I’ve found buying canning jars by the case, tobacco by the pound and dividing it into 2 ounce portions then canning it, cuts cost by about 40%.