Do you save unused condiment packets from fast-food restaurants? These packets can be handy when traveling or if you run out of something at home. Common single-serve packets include ketchup, mustard, mayonnaise, soy sauce, hot sauce, parmesan cheese, salad dressing, sugar, salt, pepper, and plastic jelly cups. How long can you keep single-serve packets? If … Continue reading Expiration Date of Condiment Packets