Fabricators of any kind as art supplies like thinners and alcohol come in these drums.
Also, "Part A, Part B" epoxies come in these.
A friend gave me an empty 6 gallon (5 gallon + 1 free) Thompson's Water Seal can. It was very well made.
I've never seen one like that with common chemicals. Most have the single pop up opening. I've been on the lookout for 15/16 gallons versions for years but have been out of luck.