Rolled up it’s 3.3 by 3.1 inches, held closed by an elastic band, so it sits at the bottom of a purse or a glovebox and takes up no room until the moment you need it.

Open, it’s 19.6 by 13.7 inches, with a zipper across the top. Cans, jars, snacks and a box of tissues all go in one bag, so one trip from the car replaces four.

The oxford cloth is water-resistant, so rain drips and small spills wipe right off.

Two long straps with slide buckles let you throw it over your shoulder when it’s heavy or carry it by hand when it’s not. Done, it rolls back up in seconds.