Measure your torso from the C7 vertebra at the base of your neck to the top of your hip bones, then match that number to the pack’s size chart.
Getting the torso length right is the single biggest factor in whether a pack feels like a second skin or a torture device. A pack that’s too long rides up and digs into your shoulders; one that’s too short shifts your hips out of the load-bearing zone. The good news is that the measurement takes about two minutes and requires no special tools. Every major pack maker uses the same two landmarks, so once you know the number, you can shop any brand with confidence.
Here’s the process, step by step.
Find The Two Landmarks On Your Body
Torso length is measured between two bony points you can locate in under a minute. The first is the C7 vertebra — the prominent bump at the very base of your neck. The second is the iliac crest, which is the top edge of your pelvic girdle, right where your hip bones sit.
Locate C7 At The Base Of Your Neck
Tilt your head forward. The most prominent bone you feel at the base of your neck is the C7 vertebra — that’s your starting point. It’s the one that sticks out most when you look down. Don’t start from the soft tissue higher up; the cited guides are specific that C7 is the correct landmark.
Locate The Iliac Crest At Your Hips
Place your hands on your hips the way you naturally would — thumbs back, fingers forward. Your thumbs now rest right on top of the iliac crest. Imagine a line drawn straight across your back at that level, running between your thumbs. That line is where the measurement ends.
Measure From Neck To Hip Along Your Spine
Now the actual measurement. Use a flexible tape measure or a piece of string and a ruler — never a rigid metal tape directly on the body. The tape needs to follow the natural curve of your spine, not run in a straight vertical line.
- Hold the zero end of the tape at the C7 bump.
- Let the tape drape down your back, following the curve of your spine.
- Stop at the imaginary line you drew between your thumbs on the iliac crest.
- Note the number in inches — that’s your torso length.
If you’re measuring alone, the string method is easier: hold one end on C7, let the string fall to the hip line, mark it, then lay it against a ruler. Both ULA Equipment and Hyperlite Mountain Gear describe the same landmarks in their fit guides — C7 at the neck and the iliac crest at the top of the pelvic girdle. ULA specifies measuring in inches from C7 to the point where the iliac crest line intersects the spine. This consistency across manufacturers means your number will translate cleanly from brand to brand.
Match Your Number To The Pack’s Size Chart
Here’s the catch: your torso measurement doesn’t map to a universal size. Each brand uses its own ranges, so a 19-inch torso might be a medium in one model and a large in another. Always check the specific manufacturer’s size chart for the exact pack you want before ordering.
| Measurement Step | Landmark Or Tool | Common Mistake |
|---|---|---|
| Find the start point | C7 vertebra (bony bump at neck base) | Starting from soft tissue higher up |
| Find the end point | Iliac crest (top of hip bones, at thumb line) | Measuring to the waistband instead |
| Tool | Flexible tape or string + ruler | Rigid metal tape that won’t curve |
| Path | Follow the spine’s curve | Straight vertical line, skipping the curve |
| Mapping | Match to brand-specific size chart | Assuming one size fits across brands |
One more warning: standing height is not a reliable proxy for torso length. Two people of identical height can have completely different torso proportions, so the landmarks are the only accurate method. Once you have your measurement, you can confidently compare models. If you’re ready to see which hiking bags fit best for your torso size, our tested roundup breaks down the top options side by side.
FAQs
Do I measure my torso from the shoulders or the neck?
Neither. The correct starting point is the C7 vertebra — the prominent bump at the base of your neck that sticks out when you tilt your head forward. Measuring from the shoulders or soft neck tissue will give you an inaccurate number that doesn’t match any pack maker’s size chart.
How do I measure my torso length by myself?
Use the string method. Hold one end of a piece of string at the C7 bump, let it hang down your back to the iliac crest line (where your thumbs rest when your hands are on your hips), mark the spot, then lay the string flat against a tape measure. This is easier than trying to read a flexible tape over your shoulder.
Why does my hiking pack size chart say a different size than I expected?
Because torso size ranges are brand-specific. A 19-inch torso might be a medium in one model and a large in another. Always check the manufacturer’s size chart for the exact pack you want, and note that some models also adjust via hip belt position, which can fine-tune the fit further.
References & Sources
- ULA Equipment. “How to Measure for the Perfect Torso and Hip Belt Fit on Your Backpack.” Describes measuring in inches from C7 to the iliac crest intersection.
- Hyperlite Mountain Gear. “Hiking Backpack Size Chart.” Uses the same C7 and iliac crest landmarks with a thumb-line reference.
- Paddy Pallin. “Pack Fitting.” Details the torso measurement process and common fitting mistakes.