The proper way to pack a backpack: First assemble all of your gear, arrange by weight, and then pack...
1. Bottom – Mid-weight items (sleeping bag, air mattress, light clothes)
2. Middle back – Heaviest items (bladder/reservoir, cookwear, food, fuel, battery bank)
3. Front – Lightest items (pillow, light clothes, towel)
4. Top – Lighter items that you may need access to quickly (snacks, first aid, rain gear, TP)
5. Hip belt - quick or often used items (snacks, phone, chap stick, map)
Keep the center of gravity nearest your spine. If strapping gear to the outside of the pack, make sure it's the bulky but lighter items (sleeping bag or foam mattress). Wet clothing can be secured outside to dry while hiking. Nest items when possible (fuel canister inside cook pot). Carry only as much water as needed. Water weighs 2.2 lbs per liter. Put the filled bladder in first before packing the rest.Water bottles in side pockets.