Martha Stewart Living,
Lighten your carload by arranging supplies in a handled bin. Items kept in the car have a tendency to roll around and get lost beneath seats, so it helps to organize them in a heavy vinyl catchall (available at home stores). Stock it with paper towels, a first-aid kit, auto fire extinguisher, duct tape, flat-repair kit, bungee cords, and a bag filled with flares, jumper cables, and other necessities. Also consider packing a messenger bag with bottled water, granola bars, a blanket, and warm clothing, in case of a breakdown.