The following information will assist you in choosing the right bag on your own or to insure that a salesperson is doing their job.Your height does not determine which backpack is suitable. You need a measure of your back from A to B (see diagram).
Have a friend assist you. Tilt your head forward as it will help your friend locate the bony lump at the base of your neck. This is A. They can use a piece of masking tape for reference if necessary.
Locate the pointy protrusions (iliac crest) on the front of your hips by sliding your hands down the side of your torso. Once you locate the crest, point your thumbs (hands on hip pose) toward each other on a parallel line. Where this imaginary line (or placed masking tape) crosses the spine is B.
Your friend will then measure the distance, following the natural curve of your back, from A to B .
You will mostly likely fall into one of these 3 categories:
Small - up to 44cm/17.5", Medium/Regular - 45c m to 49cm/18" to 19.5", Large/Tall - 50cm/20" and up.
Armed with this information you can now try on some packs. Start with weighted items supplied by the store; items of personal gear packed into stuff sacks. Distribute these throughout a pack's interior, keeping the weight close to your body with the heaviest portion near your shoulder blades.
1. Loosen the pack's shoulder straps, loadlifter straps and hip belt. (see "The Backpack")
2. Slip your arms through the shoulder straps.
3. Position the hipbelt so it basically straddles your hipbones (iliac crest); close the buckle and make the hipbelt straps snug. The belt should completely, comfortably cover your hips, but its 2 ends should not touch. If the belt is too loose or too tight, reposition the buckle pieces on the hipbelt straps. If this doesn't give you a secure fit, you may have to try a different pack or hipbelt. Do not tighten your hipbelt excessively. Keep it snug, but if it's too tight or too long on the trail, you'll have sore spots on your hips the next morning.
4. Cinch the shoulder straps down tightly, then ease the tension slightly.
5. Look sideways in a mirror. The padded sections of the shoulder straps should wrap around the crest of your shoulders comfortably and attach to the frame about 2.5cm/1" below that point. No gaps should appear.6. Check your load-lifter straps. These should attach to your shoulder straps at a point just above your collarbone and just below the top of your shoulders. From there, they should rise up to join with the frame at an angle of between 40 and 50 degrees. If the angle is higher than that, your frame is too long. Any lower and your shoulders will carry too much of the load.
7. Check the shoulder strap length and width:
• The buckle on the strap should be a hand-width below your armpit that it won't chafe.
• The straps should be far enough apart that they don't squeeze your neck, but close enough together that they don't slip off of your shoulders during hiking. The width is sometimes adjustable.
• Women need to pay special attention to the fit of shoulder straps. On some unisex packs, the distance between shoulder straps may be too wide, or the straps themselves are wide enough to gouge an armpit or breast. If you find a good fit is elusive, seek out a pack designed specifically for women.
8. Check for a good torso fit. If the pack fits you correctly, you should be able to redistribute the weight of the pack between your shoulders and your hips simply by loosening and tightening your shoulder straps slightly. Adjust the sternum strap. Position it about 2" below your collarbone. You should be able to breathe comfortably when the strap is fastened. It is not essential that you keep your sternum strap fastened at all times. It is most helpful when you are negotiating uneven terrain.

9. Check for comfort:
• Does the pack feel good on your back?
• Does it pinch or bind or unusually restrict your movement?
• Can you look up without hitting the pack with your head?
• Can you squat down without cutting off the circulation to your legs?
This may seem like a lot to keep in mind, but all of the above will become automatic as you gain experience. Now walk around with your pack. Climb and descend a flight of stairs. Hop from spot to spot. Reach. Walk a line. If anything is pinching, try adjusting the various straps.














