I use a factory sealed 1-kg. jar of peanut butter as emergency rations in my vehicles. I should probably double that. You can hardly get a more concentrated food source. And the price point, as the OP notes, can't be beat.

I rotate the PB out of the cars every year and a half. Then, since it's cheapie stuff, it becomes treat food for the hounds. Dogs are crazy after PB.

I frown at the term 'natural' in this particular product since they've removed the peanut oil and replaced it with palm oil. A shelf life thing, perhaps? I'm not certain it's much better for you than hydrogenated vegetable oil. Then again, if I'm desperate enough to eat a lot of peanut butter, I'll be burning every possible calorie and LDL will hardly be a pressing concern.

It has to be smooth, by the way.