Because these still retain some moisture it is best to store the fried onions in an air-tight container with a paper towel and place them in the fridge. They are generally too moist to keep out or in the pantry like the name brand since they're not fried all the way through and dried. Mine have been still relatively crispy after two or three days but I think about 4 days would be the maximum. If needed to crisp up, place in a 300°F oven for about 5 minutes. You can also reheat them in the microwave on a paper towel for 15 seconds, though they won’t be as crispy as an oven reheat.