Sunscreen, bugspray/stick, lferas, safe hand sanitizer (like CleanWell), extra wipes, TWO diapers (because inevitably you use the one you had stashed in there and forget to replace it!), changing pad, teether, shelf-stable/heat-stable snacks like granola bars, raisins, floss (don't laugh, it really comes in handy and is so tiny it doesn't take up much room), extra pony holders (for mom!),I'd leave the windshield fluid at home. The heavier the items you lug around, the more gas you burn.