I think I used an 8" ruler, but here is the technique
http://quiltville.blogspot.com/2012/...h-folding.html
bonnie's cupboard is deep and narrow so she folds to suit her space.
The magic with ruler folding is you can see fat quarter sized fabric and yardage both in the stack, because it is all folded and stacked the same. No more digging just pull the stack, take out what you want and put stack back together.