I took a bite of one, then decided to save the rest in case I didn't have time to grab breakfast before my flight the next morning. Stuffed the open package in my purse and forgot about it. Swapped out purses for a few weeks. Last week (3 weeks later), I decided to use that purse. I came across the remains of the DD brownie. Scarily enough, it was still moist and pliable, even after being open for three weeks--and no sign of mold. Makes me wonder exactly what's in them .