You will need:
A soft measuring tape and a friend.
1. Tilt your head forward and feel for the bony bump where the slope of your shoulders meets your neck. This is your 7th cervical (or C7) vertebra—and the top of your torso length.
2. Next, find your Iliac Center. This is the point in the centre of your spine that aligns with the highest boney point on your hipbone.
3. Tilt your head back up and have your friend run the tape straight down your spine from your C7 until you reach your Iliac Center.
This is your torso length. Check it twice to be sure! Use your torso length to determine your pack size.
To determine hipbelt size, measure around the hips at the iliac crest, (the boney part of your hips) not the waist.
Aarn Hip-Belt Size Guide:
Small: Between 64 cm - 80 cm
Medium: Between 81 cm - 90 cm
Large: 91 cm - 100 cm,
Extra Large: 101 cm - 120 cm
If you are on the cusp, go to the bigger size.