Shelter first Check your tent, stakes and rainfly before the trip. Match the sleeping setup to the expected conditions and bring insulation underneath you as well as above you.
Plan the meals Write down each meal and pack the tools needed to make it. Include drinking water and a way to manage dishes and rubbish. Follow the campground's food-storage rules.
Light and weather Check headlamp batteries and pack a backup light. Carry layers and rain protection that match the forecast. Keep critical dry items in waterproof storage.
Do a driveway test Set up unfamiliar equipment at home. Check missing parts while you still have time to replace them.
Leave it ready Dry equipment after use and record what needs replacing. The best checklist is the one you refine after each trip.