Mine are ruler folded and sorted by colors and categories in bins and drawers. The batting and larger pieces for backings are in stand-up bags from Ikea that were designed for recycling. They have a window where you can slip in a label. While there's plenty to get me started on whatever I'm motivated to do, it's not such a huge amount that I can't find things. I hope I can keep it at about the level it is now because much more and it might get overwhelming. I live in a large suburb and have plenty of fabric stores to go to if I need something in a hurry - I'm happy to let them store the bulk of it until I'm ready to buy.
I figure my family would consider my stash to be a lot more than anyone could possibly need, but it's a pittance compared to some I've seen on this board. Still, I probably couldn't possibly live long enough to use it up, even if I reach 100. I have to remember to leave a note on the top of the bins with information about how to contact my guild so the DH and kids can donate what they don't want to deal with some other way. I definitely do not want to risk anyone just trashing it, but I don't want them to think of it as a burden, either.