These EXTRA-SMALL, RULED MOLESKIN VOLANT NOTEBOOKS are absolutely perfect for keeping my To-Do lists.  At 2-1/2 by 4 inches, with just 28 pages, each notebook is small enough and thin enough to slip comfortably into the undersized pockets found in women's clothing.  If I carry one of these with me, I can jot down all those odd tasks that come to mind when I'm busy doing something else.