Fitting Rab Backpacks – A fit and size guide

Why Fit Matters

A well‑fitted backpack transforms your adventure—from scrambling up crags to multi‑day alpine treks. It should move with you, not against you, allowing full mobility without rubbing or pulling. Here’s how to ensure yours is up to the task.

Step 1: Measure Your Back Length

1. Locate your C7 vertebra, the prominent bone at the base of your neck (tilt your head forward to feel it).
2. Place your hands on your hips—the iliac crest is the highest point of the hip bone.
3. Measure downward from C7 to the top of your iliac crest—this is your back length.

Step 2: Choose Your Pack

• Look for back length and fit details listed on each of Rab pack’s product page.
• Some packs include adjustable back systems for a more personalised fit.
• Larger capacity models frequently offer Narrow Dimensions (ND) versions—crafted for smaller frames or more streamlined ergonomics.

Step 3: Fit It Properly

A backpack’s harness comprises four main components:

• Hip Belt: Supports the majority of load. Position it so the top edge sits about 1” above your iliac crest. It should carry most of the pack’s weight—not your shoulders.
• Shoulder Straps: Should feel snug without restricting movement. They stabilise the pack without lifting it off your hips.
• Load Lifter Straps: These help pull the weight forward and closer to your body. Adjust gently to balance weight—stop before unweighting your hips.
• Sternum Strap: Keeps shoulder straps in place. It shouldn’t compress your chest or impede breathing.

Fitting sequence:

1. Load your pack with typical touring weight.
2. Adjust the back length (if possible) to match your spine measurement.
3. Wear the pack and loosen all straps.
4. Fasten and tighten the hip belt first.
5. Shoulder straps next—secure but comfortable.
6. Fine‑tune load lifters to shift weight forward.
7. Finally, engage the sternum strap for overall stability.

Each adjustment brings more comfort and control on extended journeys.

Suggested Weight Ranges by Volume

These are general guidelines; individual preference, terrain, and trip style may influence your best fit.

Understanding ND (Narrow Dimensions) Packs

• ND packs are designed with slimmer profiles, ideal for smaller frames or a body‑hugging fit.
• For smaller day packs, choosing ND may result in slightly lower capacity compared to the regular version.
• Packs over 50 L generally maintain equal volume across both ND and regular versions, while offering a refined fit.

Why Rab Packs?

• Built rugged yet lightweight, for effortless movement on any terrain.
• Adjustable harness systems ensure comfort even under heavy load.
• Designed for multi‑discipline use: from ski touring and peak ascents to remote treks.
• ND fit options make our packs inclusive and more ergonomically tailored.

Final Tips

• Always take your back length measurement before ordering.
• Test‑fit a loaded pack—adjust straps systematically for the best balance.
• Wear your kit (layers, hip belt, harness) and carry typical weight when fitting.
• Revisit adjustments once on trail—especially after load changes or wear-in.

With this guide, we want to help you choose the right backpack—not just in size and volume, but for sustained comfort and peak performance across alpine trails. Ready to explore? Gear up, step out, and climb strong.