I could overload my pockets carrying around all kinds of special purpose labels and stickers, and track my stock of them so I don't run out....or I could carry

I could overload my pockets carrying around all kinds of special purpose labels and stickers, and track my stock of them so I don't run out....or I could carry a pen. > Do you people really not keep a book of stamps in your car? No, why would I do that?