I go bananas every time I have to pack up Sunday dinner leftovers for my kids to take home with them. I fill the bottoms, but the tops appear to match, but they don’t lock, this is very tricky! Now, I’ve gone through a oodles of lids, but none are a mate to my receptacle! I found a way to end this madness! It’s time consuming at first, but when you’re done it’s forever! Match your containers and assign corresponding numbers or letters to them. Write with permanent marker on top and bottom to this marriage and you are DONE! No more match game, no hassle, no mess!