I use an 8 1/2" x 11" sheet folded twice. This fits perfectly in a back pocket and gives me 4 pages to make notes on. I usually reserve two pages for the catego

I use an 8 1/2" x 11" sheet folded twice. This fits perfectly in a back pocket and gives me 4 pages to make notes on. I usually reserve two pages for the categories of "personal to-do" and "business to-do". As items are completed they are crossed off. Once notes get too crowded or most items have been checked off or crossed out (completed), I unfold the sheet, copy incomplete items to a new folded sheet and put the the old sheet in a file.