How do you sort/store your paper? My 8 1/2 x 11 solid is in those "in and out" trays. The 12x12 is in those sterite drawers by color. My problem is some is heavier weight than others--usually the double sided is heavier and I like to use that for the base of a card. I was looking for some for that purpose this week and was very frustrated b/c MOST of my 12x12 is one sided for scrapbooking. How do you store yours? Do you separate dbl sided from one sided? Heavier from lighter?