One of the most annoying parts of packing lunch is when youre making a salad and dont know where to put the dressing. Those separate, teeny-weeny dressing containers take up space and tend to leak, and pouring dressing into a plastic bag can get messy.

Thats why were so thankful one Facebook user recently reminded the world of a nifty little hack in Glad food containers:

Thats right, those circles on the lids of nearly all Glad brand food containers are made to hold pop-in dressing cups .

If you havent noticed this before, its not your fault: Though the dressing cups can pop into almost all Glad lids , theyre only sold along with one type of container, the To Go Lunch containers .