Do you stow unused condiment packets from fast-food restaurants? These packets come in handy when traveling and when you run out of something at home. The most common single-serve packets include ketchup, mustard, mayo, soy sauce, hot sauce, parmesan cheese, salad dressing, sugar, salt/pepper, and plastic jelly cups. How long can you keep single-serve packets? … Continue reading Expiration Date of Condiment Packets