Underwear should not be folded when stored, and the cups should not be sunken, because it will deform the underwear. The deformation of underwear will affect the wearing effect and human health, so when you store underwear, don't think it can be folded casually.
When storing underwear, it is best to number all underwear one by one, so that the cups of underwear will not be deformed and look neat at the same time. However, when taking it, it is recommended not to take it casually, but to start with the first one, otherwise your neatly folded underwear will be messed up by you.
If you think that the way of stacking one by one is too elegant, you can choose the hanging way, that is, hang the underwear one by one with a hanger and then hang it in the closet, so that it is more convenient to choose when you want to wear it.
There are also boxes selling underwear in the market, and there are usually partitions to separate underwear. This is actually similar to the stacking method, but it is more convenient to take out and looks simpler. When traveling, it is best to store underwear separately, not at the bottom, so as not to be pressed into the cup by other things.