I keep track of what we run out of and what we need from the store by putting a blank dry erase board (about 8X11) on the fridge. When someone in the house uses the last of something, they write it on the board. I add things to it as well, such as paper towels, toilet paper, etc. Then, when I go to the store, I take the board with me, place it in the basket of the cart and as I find items on the list, I wipe it off. When the board is cleared, I'm done shopping! In addition to getting the entire family involved in the household management, I no longer have to empty my purse of all the little hand-written, paper/pen lists that used to pile up in there. When I get home, the board goes back on the fridge and the process starts over again. It's great!