I bought this great 8 pocket organizer from Walmart for $4. It has four large pockets and then in front of each is a smaller buckled pocket. (Wish I could post a picture.)
I use the larger pockets to put my bills unfolded in order by date due (one pocket per bill) then as the bill gets paid, I fold it in half write the date I paid it and stick it in the smaller buttoned pocket.
It has really helped me get my bills under control. No more piles of mail and no more missed deadlines/late fees
They come in four different colors. I set my mother in law up with a blue one for Credit card bills, green for taxes and lawyer bills, pink for utility bills. she has all three pocket organizers in one of those cardboard magazine holders and now all you see is clean! No clutter and easy to maintain.