Article: Distributing the weight so that the lightest items are at the bottom, he heaviest items are centered between your shoulder blades and the medium items are stashed around them is the best way to keep your back healthy. If you pack the heavy items first, you'll be putting a lot more strain on your back. Packing the heavier items right along your upper spine situates the weight of the pack on your hips, rather than in a place where it would cause injury.  If you're camping overnight, pack your sleeping bag and other light sleep-related items first. On top of those, pack your changes of clothing, extra socks, extra gloves and so on. Pack the heaviest items: your water, your flashlight, your heavy cooking supplies and so on. These should be centered between your shoulder blades right up against your back. Then pack medium-weight cooking supplies, food supplies, your first aid kit, and other medium-weight items so that they surround the other items and stabilize your pack. Wrap flexible items like tarps or clothing around the heavier times to keep them from shifting as you walk. There are a few items that you'll need to have handy, so even if they're light, they should go on top or in the outer pockets. You'll want food and water handy, as well as your map, GPS, flashlight, and a few first aid items you anticipate needing. Pack these items carefully so you know just where they are when you need them. After a few days on the trail, you'll get a better sense of what you need to be accessible and what you don't. Rearrange your pack as you go so that it's packed to be as convenient and comfortable as possible. If the gear you have won't fit in your backpack, you can attach it externally by strapping it to the top, bottom or sides of your pack. For example, you might want to attach your tent poles to the top of your backpack, or hang your water bottle from the side. If you choose to attach items externally, there are a few things to keep in mind:  Attach as few external items as possible. It's better to pack everything you can, since as you hike you'll end up catching your gear against trees and other obstructions. Keeping it contained makes for a more comfortable walk. Follow the rules for weight distribution. For example, attach your heavy tent or walking poles to the top of the pack, not the bottom. Lift the pack onto your body and tighten the compression straps to a comfortable position. Walk around to see how it feels when you carry the pack. If you can walk around comfortable, and the pack feels compressed and secure, you're good to go.  If you feel things shifting around, remove the backpack and repack the items so they're more compressed and stable, then try again. If the backpack feels tippy, remove it and repack it so the heavier items are centered between your shoulder blades right against your spine. They were probably too high in the pack before. If it feels off balance, repack it and try to distribute the weight more evenly on either side. If it's way too heavy, think about what you can leave behind. If you're walking with a group, see if someone else has room to bear some of your load.
What is a summary of what this article is about?
Pack the lightest items at the bottom and the heaviest close to your back. Keep essential items immediately accessible. Attach external items. Check the pack to see how it feels.