Ever moved and thought "Damn, where did I put <one little thing that you just tossed into a box because you had a little bit of space left...>"? Instead of writ

Ever moved and thought "Damn, where did I put <one little thing that you just tossed into a box because you had a little bit of space left...>"? Instead of writing every little thing (which could be dozens, or a hundred small ones!) you can just say what it is as you place it in. Less work, less remembering when you're done loading up a box. Don't have to sit and read 30 boxes to find the right one -- just have to find the right number.