I've got the same pack. I love it and I am small. Here's what I do: Run your hand along the meshing that goes against your back. There is velcro. You can adjust the internal frame up or down. I have mine all the way down for smallest size to fit my back. Now loosen all straps, shoulder, side and hip. Put pack on. Tighten hip belt first. Make sure buckle is squared on top of your belly button. Tighten hip straps evenly (very important). Make sure hip belt is VERY snug. Hips will carry most of load. Now tighten side straps evenly (same time). It will make pack lay nicely on your back. Lastly, tighten shoulder straps evenly. Not too tight. I usually tweak these during the day. Each time I take my pack off I loosen all straps and begin again. Especially helpful after a big meal or when posture changes due to pain or fatigue. Only takes a few seconds. Hope this helps!