Slim 5 gallon container?

[saltfishguy18]

Looking to set up my auto top off. Unfortunately I do not have much room under my stand for a full 5 gallon bucket or on the side of my tank as my couch is right next to my tank. Anybody know of a slim 5 gallon container that is food grade that would work for this application???

 

[lakeviewink]

Pet food container at Walmart. They are 7g tall slim Tupperware style. Also, the same container at Home Depot, in black, is called a charcoal briquet container.