If you are doing a Whole30 Paleo Challenge, you are probably trying to make extra portions to save time later. You know the idea – cook once, eat twice. I try to double recipes, but often this means my teens eat larger portions. When I do have leftovers, I use these handy little labels to see at a glance how long something has been in the fridge. Since the days of the week are printed and color-coded, you can tell at a glance when the food was prepared.
Granted mine are in Dutch, but I am sure you can find some in your own language. I found them at a restaurant supply shop. They were a little pricey, but they are really easy to use. They are easier than writing out a label.