Last updated: 23rd April 2026 · Manufacturer recommendations and technology change, ergonomics fundamentals remain constant. We update this guide regularly – for specific model fitting questions, also check osprey.com or deuter.com.
An improperly adjusted hiking backpack can turn your adventure into torture – whether you're on a day trip or in trekking mode for a multi-day hike. Proper adjustment isn't rocket science: with just a few minutes' effort, you'll distribute the weight so your hips and pelvis carry most of the load – keeping your shoulders free. In this guide, we'll show you how to determine the correct torso length, the 5-step workflow for adjustment, what women and children need to consider, and how to master longer treks without backache.
Why Proper Adjustment is Crucial
The physics behind a well-fitting hiking backpack is simple: 70–80% of the weight should rest on your hips, only 20–30% on your shoulders. Anyone carrying the load primarily on their shoulders will tire quickly, develop neck tension and struggle with fatigue.
Weight limits: for day hikes maximum 10%, for multi-day treks up to 15% of your body weight. So if you weigh 70 kg, you shouldn't carry more than 7–10.5 kg – including water, food and equipment.
Finding the Right Torso Length
The most important measurement before buying a backpack is torso length – not your height. Measure the distance between your seventh cervical vertebra (C7) and the top of your hip bone crest:
- Tilt head forward – the largest protruding vertebra at the neck is C7
- Place hands on hips – your thumbs indicate the hip bone crest
- Use a tape measure to measure the distance along your spine
Torso Length Size Overview
Modern backpacks often feature an adjustable carrying system that allows you to adapt the torso length by 5–10 cm. This is now standard in high-end models from Osprey or Deuter.
The Right Volume for Your Trek
Besides torso length, the litre volume determines the right backpack. Rule of thumb:
| Trek Type | Volume | Typical Use |
|---|---|---|
| Half-day hike | 15–20 L | Snacks, jacket, water |
| Day hike | 20–30 L | Extra clothing, first aid, provisions |
| Hut weekend | 30–45 L | Change of clothes, hut sleeping bag |
| Multi-day trekking | 45–60 L | Tent, sleeping mat, stove |
| Expedition & winter | 60–80 L | Winter sleeping bag, gear, food |
Tip: Better to fully pack a smaller backpack than carry a large one half empty. Half-empty backpacks shift around, the centre of gravity moves and the carrying comfort suffers. For undecided buyers: our hiking backpack collection shows common volumes in comparison.
Women's Hiking Backpacks – The Differences
Many manufacturers offer models specifically adapted to female anatomy. This is more than marketing – the differences are anatomically based: shorter torso length, narrower shoulders, wider pelvis. Women's backpacks account for this with several details:
- Shorter back panel: fits torso lengths typically between 38 and 50 cm
- Angled hip belt wings: follow the shape of the female pelvis
- Conically shaped shoulder straps: run closer to the décolletage, don't chafe the chest
- Softer padding material in the chest area
Leading brands like Osprey (e.g. Osprey Kyte, Mira, Tempest), Deuter (Aircontact SL, Futura SL) or Jack Wolfskin have dedicated women's lines. Look for designations "Women's Fit", "WS" or "SL" (slim) when purchasing.
Children's Backpacks – Finding the Right Model
Different rules apply for children as their musculoskeletal system is still developing. The 10% rule for weight is absolutely binding for children – even less is better. Other important criteria:
- Short but already adjustable back: grow-with principle for 3–5 years of use
- Padded hip belt: even for children it transfers the load to the pelvis
- Bright colours or reflectors: visibility on the trail
- Maximum volume 10–25 L for children between 6 and 12 years
- Integrated rain cover: children's rain covers are often included
In our children's backpack section, you'll find models from Jack Wolfskin and other brands in age-appropriate sizes. For toddlers up to 3 years, there are child carriers – such as the famous Osprey Poco.
Adjusting Your Hiking Backpack – 5 Steps
Now for the adjustment. Important: Pack the backpack first – then adjust it. Only under real load will you feel if everything fits properly. Always work through the 5 steps in this order:
The 5-Step Workflow
From loose to tight – sequence matters.
Loosen all straps
Put on the packed backpack. Completely loosen hip belt, chest strap, shoulder straps and load-lifter straps – essentially to "zero".
Position hip belt
The hip belt wings sit CENTRALLY on the hip bone crest – not on the waist. Close and tighten the belt firmly, but don't let it cut in. 70–80% of the weight rests here.
Tighten shoulder straps
Now tighten the shoulder straps until they rest directly on your shoulders. The transition from strap to backpack should sit between your shoulder blades – not at the neck or below the shoulder blades.
Fasten chest strap
Tighten only lightly – it stabilises the fit but shouldn't restrict breathing. Adjust height so it sits about 2–3 fingers below your collar bones.
Fine-tune load-lifter straps
The short straps at the top of the shoulder straps pull the backpack closer to your body. Tighten at about a 45-degree angle – this prevents wobbling, even on rough terrain.
Common mistake: Many people tighten the shoulder straps first, then the hip belt. This shifts the load to the shoulders – exactly what we DON'T want. Always proceed in order 1 → 5.
Proper Packing – Weight Distribution in the Backpack
Even a perfectly adjusted backpack suffers if you pack it incorrectly. Rule of thumb: Heavy items close to your back, light items outwards and downwards. Three zones:
Tips for Pain-Free Hiking
Check weight: Weigh your kit before the trek. Day hikes maximum 10% of body weight, multi-day up to 15%. Refill water along the route rather than carrying several litres – every litre of water saves 1 kg on your back.
Micro-movements on the trail: Every few minutes, gently circle your shoulders, shift weight slightly, stretch whilst walking. This keeps muscles loose and prevents tension.
Pre-conditioning: Just 10 minutes of daily training helps enormously: planks for core strength, shoulder circles, stretching chest muscles. Especially for long trekking tours, this makes the difference between enjoyment and suffering.
Plan breaks: Every 60–90 minutes, take off the backpack, loosen shoulders, breathe deeply. Your back will thank you – and you'll enjoy the scenery more consciously.
Which Hiking Backpack Suits You?
Depending on your intended use, we recommend the following types – with our category selection you'll find the right model:
- Day hikes / walking: Hiking backpacks in 20–30 L
- Multi-day trekking: Trekking backpacks from 45 L with internal frame
- Alpine mountain tours: Alpine backpacks with ice axe attachment
- Mountain bike tours: Bike backpacks with hydration system
- Weekend travel: Travel backpacks – hybrid use for city breaks and hut walking
- Children from 6: Children's backpacks
More packing and trip planning tips can be found in our guides How to pack a backpack correctly, Ultralight trekking and Bikepacking packing list.
Frequently Asked Questions About Hiking Backpacks
How do I properly adjust a hiking backpack?
In 5 steps: 1. Loosen all straps, 2. Tighten hip belt on hip bone crest, 3. Tighten shoulder straps, 4. Lightly fasten chest strap, 5. Tighten load-lifter straps. Important: 70–80% of weight on hips, only 20–30% on shoulders.
How do I measure the correct torso length?
Measure the distance between your seventh cervical vertebra (C7 – the largest protruding vertebra at the neck) and the top of the hip bone crest (place thumbs on hips). Under 45 cm = size S, 45–52 cm = M, over 52 cm = L.
How much should my hiking backpack weigh?
For day hikes maximum 10%, for multi-day treks up to 15% of your own body weight. A 70 kg person should therefore carry no more than 7–10.5 kg – including water and food.
Do women need a special hiking backpack?
Women's backpacks have shorter back panels, more angled hip belt wings and conically shaped shoulder straps – this better suits female anatomy. Manufacturer designations: "Women's Fit", "WS" or "SL".
How do I pack the backpack correctly?
Heavy items close to your back at shoulder blade height (water, tent, stove), light items at bottom as padding (sleeping bag) and top/outside for quick access (rain jacket, snacks, first aid).
What do I do if the backpack presses or chafes?
Usually due to incorrect adjustment: hip belt sits too high (on waist instead of hip bone crest) or shoulders carry too much load. Loosen all straps, readjust in sequence 1–5. If it continues to chafe: torso length doesn't fit – change model or adjust carrying system.
Conclusion
A perfectly adjusted hiking backpack makes the difference between an enjoyable trek and a torturous march. With the right torso length, suitable volume and the 5-step guide, you'll distribute the load optimally across your body, prevent back pain and shoulder tension, and stay fresh even after 6 hours on the trail. Off to your next adventure – and if you don't have a suitable backpack yet, you'll find the right size for every trek in our hiking backpack category.
