Store it with the bellows compressed (making sure the bellows are nice and dry, especially if you just were out in the rain, etc.). On my 4x5, I find I really do have to store it compressed if I want to use wide angle lenses. If I store it stretched out somewhat, it's harder for me to use the short focal lengths when I go to compress the bellows. My 8x10 doesn't seem to have that problem, but it's much older. I still keep it with the bellows compressed when it's not on a tripod, however.