Paper cupcake cups in bento lunches... they don't work. They look nice at first but when you open up your bento box after being in there for a few hours with the moisture, they basically lose all function. They get wet and loose their shape and turn into a flat circle of wet paper. So when you go to take your food out it basically spills everywhere. I think they may do okay if everything in your meal is dry but they definitely do not work with anything like fruit or veggies.What a mess! I recommend silicon all the way.