MOM Tip: Jars, Bottles, Containers line the shelves of my refrigerator all opened at one point, but when? So, after several refrigerator clean outs and asking myself that question I decided it was time to label the opened jars, bottle and containers in our fridge. So, we know how long it has been sitting in their waiting to be consumed. I keep a sharpie pen in the drawer near our refrigerator and when I/we open something or place food in a container we now label it with month and day. Now we know how long it has been living in our refrigerator no more guessing and we have reduced our food waste as well.