I've done it before without problems. Even if they're peanut butter & jelly (something that's typically stored in the fridge), it has so much sugar in it that it's inhospitable to microbes. read more
I prepared peanut butter sandwiches for the kids, and would like to pack it already to avoid the last minute rush (or forgetting them). We're not leaving for another 12 hours or so, and it will probably be eaten a few hours after that. read more
Jelly is the only thing in, peanut butter and jelly, that requires refrigeration. Jelly has a good shelf life until it is opened then, It MUST be refrigerated. Peanut Butter, on the other hand, requires no refrigeration to stay safe and refrigeration will actually keep it fresher longer and help keep it from going stale so soon. read more