A great 5 cent scott 810 censored solo use to a foreign destination, British Guiana from Watertown SD. and then a 4th class tag (parcelpost?)made of mason board with 3 coil pairs! Sent from a famous stamp dealer back in the day, AE Pade.
Pade sold many small lots in envelopes for $1 and $2, but some of the bigger lots were sent to customers in bags like these. In 1939, he advertised 25-pound mixtures for $15, while charging $28 for 50 pounds, $52.50 for 100 pounds and $237.50 for 500 pounds. He may have used not only flour and feed sacks but also burlap, canvas, or other types of bags or boxes for mailing larger lots. 
