I was looking today for something to carry a fiio x5 + fiio e12a stack when I am not using them. Basically I carry them in a backpack, and I also have to carry sennheiser ie800.
I had found very hard plastic cases for food. I think that those are the best for carrying stacks when not in usage, to proect against wear from being in a backpack.
This way I am able to acomodate everything, protect everything and all for 2$. I wonder why would anyone bother to buy a pelican case, which is typically 10$-30$, sometimes more, when you can buy plastic cases for food, which are about the same durity as pelican, but a very little fraction of the price.