I agree about the Bernina box. I couldn't get the feet to stay put in the box. I have a plastic box that used to be a candle sampler box when I was selling candles. It has divided areas and everything fits in nicely.
I thought that I was the only one who could not figure out how to keep all of the feet inside that cute little box----and I only have one extra foot since my machine is new and I still need lessons to operate it.
(I couldn't use cookie sheets because mine are somewhat greasy from so many cookies. I do wash the cookie sheets but they really don't come CLEAN enough to work around fabric).