How can you not have ever eaten Spam? I grew up eating it and other canned products, let me name a few of those salty products to get you through a long day on the water or in the woods.
Spam, sardines, potted meat, vienna sausages, bean dip, smoked oysters, kippered snacks, jerky, Slim Jims and of course chips.. No cooler required and all you needed was crackers or bread, mustard, hot sauce and a knife to get all the salt you need to replenish your body.
My favorite go to quick meal fishing is a 16oz Coke and 2 bags of salted peanuts. Drink some of the Coke then dump the peanuts inside and eat as you drink, the flavor is amazing. The Coke will foam when the salt hits it but just slurp up all that goodness and keep going. That will hold you for hours. I think it's the original Redbull!!!
We didn't eat it every week like the countries that love it but then again some love it and some eat to replace meat.