Here are two old Red Dot 1lb cans I have. I think the yellowed one is the 1st one I got in 1976. The price is $5.85. I continued to buy 1lb cans until 1984 when i got out of college and had my own money then started buying the 8 lb cardboard containers with the removable top. I'd use a modified powder funnel to refill the 1lb container because they were easier to use to fill the MEC 600 powder bottle with because of the narrow plastic spout. There was a 4lb can that was just a larger version of these 1lb cans.
I agree that the container shown by the original poster would be a pain to empty but I'm sure they were designed that way so they could be stacked.