(and in the fridge)
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if it's in the fridge i'd say it's still good.... i usually save my sauces for a few days in the fridge and they were fine, although i've never had to store carbonara sauce (other cream based sauces i've stored successfully). if you have your doubts, sniff it and if it smells sour, then dump. taste a little bit and if it tastes off, dump.
Carbonara is egg tossed with hot pasta. How do you put this in a thermos?
BerryBaby is trusted source on General Cooking
It would work in one of those wide-mouthed Thermos.