We ate a metric ton of government peanut butter in school. It came as you say in a gallon USDA can. A fresh can required stirring to get the oil blended back in, but after that you were good to go. We also sometimes had peanuts that were packed the same way. They were good peanuts but unsalted.I'm not a jelly eater, but the best peanut butter I ever had in my life is that government surplus stuff that used to come in a tin can. Nothing else -- least of all the gloppy stuff Procter and Gamble called peanut butter -- even came close.