How Do You Measure Back for a Rucksack?

Measuring your back for a rucksack, also known as determining your torso length, is crucial for ensuring a comfortable and efficient fit. A properly sized rucksack distributes weight effectively, preventing discomfort and improving your balance on the trail.

Why Torso Length Matters for Rucksacks

Unlike waist size, which is commonly used for clothing, rucksacks are sized based on your torso length. This measurement ensures that the pack's hip belt rests on your iliac crest (hip bones) and the shoulder straps originate correctly, transferring the majority of the pack's weight to your hips rather than your shoulders.

Step-by-Step Guide to Measuring Your Torso Length

To accurately measure your torso length, it's highly recommended to have a friend assist you. You'll need a flexible tape measure.

1. Locate the C7 Vertebra (Top Measurement Point)

The C7 vertebra is the most prominent bone at the base of your neck.

• Method: Tilt your head forward, and run your fingers down your neck. The bony protrusion that sticks out the furthest at the point where your neck meets your shoulders is your C7 vertebra. This will be the top point of your torso measurement.

2. Locate the Iliac Crest/Lumbar Spot (Bottom Measurement Point)

This point marks where the bottom of your rucksack should sit, ideally on your hip bones.

• Method: With index fingers pointing forward and thumbs pointing backward, draw an imaginary line between your thumbs. This line should align with the top of your hip bones (iliac crest). This spot on your lumbar is the bottom of your torso measurement. Ensure your thumbs are directly pointing backward towards your spine.

3. Measure the Distance

Once both points are identified:

• Action: Stand up straight and have your friend measure the distance between the C7 and the imaginary line between your thumbs. Measure along the natural curve of your spine, not in a straight line, for the most accurate result. Record the measurement in inches or centimeters.

Tips for Accurate Measurement

• Relax: Stand in a natural, relaxed posture, not overly stiff or slouched.
• Wear Light Clothing: Avoid bulky clothing that might interfere with an accurate measurement.
• Repeat: Measure a few times to ensure consistency and accuracy.
• Get Help: This measurement is notoriously difficult to do by yourself. A friend will provide the best accuracy.

Understanding Your Torso Length Measurement

Once you have your torso length, you can compare it to rucksack sizing charts provided by manufacturers. While sizing can vary slightly between brands, here's a general guide:

Note: Always refer to the specific sizing chart of the rucksack brand you intend to purchase, as these can vary. Some rucksacks also offer adjustable torso lengths, providing greater flexibility.