cel storage options

I have decided to store my cels first in cel bags and then slip them into an 11x14 toploader, like those used for trading cards but, obviously, bigger. The toploader holds the cel securely in place and is rigid enough to keep the cel flat. My top loaders are then stored vertically in a letter size file box. I don't think too much pressure is put on the cel while in the top loader and I have no fears of picking them up to look at and flip over to see both sides. This is especially nice when the douga is stuck to the cel and you can only see it from the reverse side.

Any comments or suggestions? How do most of you store your cels? Cel books seem a little flimsy to me.