I love it... Skim Milk, Mayo, Sandwhiches... all of us CPers hate throwing food out and come here for advice on whether or not this 'left out for x amount of time' food is going to hurt them.
Anyhoo, my takes on this one is that it's fine. I've packed sandwhiches to go for two day backpacking hikes and eaten day old sanwhiches before. I think if it is properly wrapped it's fine, if it's left out exposed that that's a different story.
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