"Use multiple small, waterproof stuff sacks to speed loading and keep gear dry. Put the sleeping bag at the bottom, and stash heavy items like stove and food near the center of your back, as close to the frame as possible. Distribute the tent and clothing along the sides and top. Sunscreen, headlamp, and snacks go in the lid pocket. Stash bottles of white gas in a lower exterior pocket, in case of a leak. Cinch compression straps to stabilize the load."
See more Backpacking Tips at : http://www.backpacker.com/skills/beginner/backpacking-101/