Choose a backpack with snug-fitting, comfortable shoulder straps. Make sure the straps don't rub against your neck. Check that there is no space between the straps and your shoulders when they are adjusted to fit.
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Choosing the Best FitThe hip belt of a well-fitting pack will be centered on top of your iliac crest. It won't be any higher or lower. If the hip belt slides below your iliac crest while you are trying on the pack, then it is too big. If it rests on your lower back, then it is too small.
If the length of the pack is too long, the shoulder straps won't rest on your shoulders and all the weight of the pack will ride on your hips. On the other hand, a backpack that's too short will be uncomfortable because the weight will ride on your shoulders.
Always Use Backpacks With Padded Shoulder Straps- A heavy backpack, even one that is within your approved weight restrictions, can cause pain and discomfort if you don't have the right straps on your backpack. Heavily padded straps are wider and can help distribute weight more evenly as you carry your bag.
Should I size up or size down? We recommend sizing down if you are between sizes. It is very important that the waist belt is able to securely tighten around your hips. If your waist belt is too big you will have a hard time getting the weight in your pack to transfer from your shoulders to your hips.
Here are some quick tips to correctly position and carry the load of a backpack. Adjust the shoulder straps so that the backpack is high on the back and the shoulder straps are comfortable on the shoulders, as shown below: The backpack should not sway from side to side during walking.
No matter how well-designed the backpack, less weight is always better. Use the bathroom scale to check that a pack isn't over 10% to 20% of your body weight (for example, if you weigh 120 pounds you shouldn't carry a backpack that weighs more than 12 to 24 pounds).
Don't carry the weight of the world on your shoulders, put it on your hips! For a simple webbing waist belt, the bottom of the belt should rest on top of your hip sockets. For a padded belt, the contoured center of the waist belt should cup the pronounced part of your hips (the illiac crest). Tighten until snug.
What happens if your backpack is too big? An overweight backpack causes the body to compensate for the extra weight. If you lean forward to compensate, it reduces your balance making it easier to fall. The extra weight can distort the natural curve of the middle and lower back, causing muscle strain.
If there is too much space between your shoulders and the shoulder straps, or if the anchor point of the shoulder straps is to high or low even though the hip belt is in the right position, the backpack may be the wrong size or the torso length needs to be adjusted.