What are the essential items to pack in a groceries backpack for a weekend camping trip?

For a weekend camping trip, essential items to pack in a groceries backpack include non-perishable food items like granola bars, trail mix, canned goods, and instant noodles. Also, pack a portable stove or camping stove, cooking utensils, water bottles, and a first aid kit. Don't forget to bring a flashlight, matches or a lighter, and a map or compass for navigation.