This one definitely has a place in the Martha Stewart Bible.
How to Keep Matching Sheets Together in the Closet
Don’t let your matching sheets get lost in the linen closet. Use this simple trick: Tuck the sheet set inside one of its pillowcases, and then stack according to size (twin, full, queen, king) or by the room you use the sheets in (master bedroom, guest room.)
Found on MarthaStewart.com