How do you choose a hiking backpack? Match three numbers before you look at any feature: the volume to your nights out, the torso length to your own spine, and the empty weight to what you are willing to carry. A 20-litre pack covers a day hike, 30-45 litres covers one to two nights, and 55-65 litres covers three to five nights. Torso length decides the size, not your height, and the hipbelt must sit on the iliac crest so that roughly 80% of the load travels through your hips rather than your shoulders. Everything else — frame type, fabric denier, ventilation, pockets — only matters once those three numbers are right.
How much volume do you need?
Volume is the first decision because it fixes everything downstream: the frame stiffness, the strap width and the weight you end up carrying. The mistake most buyers make is buying for the biggest trip they can imagine rather than the trips they actually take. An oversized pack carries badly on a short trip — it collapses, the load shifts, and you end up cinching every compression strap to stop it moving.
Use the table below as a starting point, then adjust for your own kit. A cold-weather sleep system, a camera and several days of food can add 15 to 20 litres to any of these figures.
| Volume | Trip length | Typical empty weight | Best for |
|---|---|---|---|
| 15-20 L | Day hike | 0.5-1.0 kg | Summit packs, short walks, a shell and lunch |
| 20-30 L | Long day hike | 0.8-1.3 kg | Full-day hikes with a shell, water and a first-aid kit |
| 30-45 L | 1-2 nights | 1.2-1.8 kg | Weekend trips, hut-to-hut, carry-on travel |
| 45-60 L | 3-5 nights | 1.6-2.3 kg | Multi-day camping with a tent and stove |
| 60-75 L | 5+ nights | 2.0-2.8 kg | Self-supported trips with several days of food |
| 75-100 L | Winter or expedition | 2.5-3.5 kg | Cold-weather trips, guided expeditions, group gear |
If you are between two sizes, take the smaller one. A 45-litre pack that is properly compressed carries better than a 60-litre pack that is half empty, and the weight penalty of the bigger frame is paid on every trip, not just the long ones. If you regularly travel with a laptop and want one bag for both hiking and city use, read how to classify travel backpacks first, because the volume logic is different.
Internal frame, external frame or frameless?
The frame is what transfers load from your shoulders to your hips. Without one, every gram hangs from your trapezius muscles, which is why frameless packs are limited to ultralight day packs and summit packs.
Internal frame
An internal frame puts aluminium or composite stays inside the pack body, close to your back. It is the default for hiking because it keeps the load tight to your centre of gravity, which matters on uneven ground and narrow trails. The trade-off is ventilation: the pack sits against your back, so heat builds up. Modern designs solve this with a suspended mesh panel or a channel-moulded foam back.
External frame
An external frame puts the structure outside the bag, so the load rides higher and further from your back. That gives better airflow and lets you carry awkward, heavy items like a canoe or a cooler, which is why external frames survive in hunting and portage packs. On a hiking trail the high centre of gravity works against you on descents and side slopes. The full comparison is in internal vs external frame backpacks.
Frameless
A frameless pack has no stays at all. It folds into nothing and weighs under 500 g, but it only works when the total load stays under about 9 kg, because above that the shoulder straps take everything. Use it for fast day hikes and summit pushes, not for multi-day trips.
How to measure torso length and set the hipbelt
Torso length, not height, decides your pack size. Two people of the same height can need different sizes, which is why every serious pack is sold in two or three torso lengths.
To measure it: tilt your head forward, find the most prominent vertebra at the base of your neck (C7), then find the top of your hip bones at the back and imagine a line between them. Measure the straight distance between the two points. Under 43 cm is a short torso, 43-48 cm is regular, and over 48 cm is long.
To set the hipbelt: load the pack with about 10 kg, loosen every strap, put it on, and fasten the hipbelt first. The belt should cup the top of your hip bones with the padding centred over them, not sit on your waist. Tighten it until it is firm but not painful, then tighten the shoulder straps until they curve over your shoulders without gapping at the top. The load lifters — the small straps at the top of the shoulder harness — should sit at 45 degrees, not vertical.
If the hipbelt sits too high or too low no matter what you do, the torso length is wrong and no amount of adjustment will fix it. This is the single most common fitting failure, and it is why buying a pack without trying it loaded is a gamble. For strap-by-strap detail, see how to wear a backpack correctly.
What fabric and denier do you need?
Denier measures the thickness of the yarn, and higher is heavier and more abrasion-resistant. It is not a quality score: a 100D high-tenacity nylon can outperform a 600D low-grade polyester because tenacity and weave matter as much as thickness.
- 100-210D high-tenacity nylon — the sweet spot for hiking packs. Light, strong for its weight, and enough abrasion resistance for rock and scrub.
- 420-500D nylon or polyester — the floor and lower panels of larger packs, where abrasion is heaviest.
- 600D polyester — durable and cheap, but heavier and less tear-resistant than nylon at the same weight. Common on budget packs.
- 210D ripstop with a grid — the grid stops a small tear from propagating. Worth paying for on any pack used in scrub or on scree.
Check the coating too. Polyurethane (PU) coating is standard; a PFC-free DWR finish is now common on better packs because it avoids the fluorinated chemistry. Neither makes a pack waterproof — they make it water-resistant. The difference matters and is explained in waterproof vs water-resistant backpacks; if you hike in sustained rain, a pack liner is more reliable than any coating.
Ventilation: mesh suspension or foam panel?
There are two schools, and the choice depends on climate more than on preference.
Suspended mesh holds the pack off your back with a tensioned mesh panel. Air flows freely, sweat evaporates, and the difference is obvious on a hot climb. The cost is stability: the load sits further from your spine, so a heavy pack feels less planted on technical ground.
Channel-moulded foam presses against your back with cut channels for airflow. It is more stable under load and warmer. In cool climates that warmth is an advantage; in the tropics it is not.
If you mostly hike above 25 degrees Celsius or sweat heavily, choose mesh. If you carry more than 15 kg on rough ground, choose foam.
Which details actually matter?
Most feature lists are marketing. These are the ones that change how a pack works day after day:
- Hydration sleeve and hose port — without a port you have to stop and unclip to drink, which means you drink less.
- Hipbelt pockets — for a phone, a snack and a map. If they are too small to fit a modern phone, they are decoration.
- Daisy chains and lash points — for poles, an ice axe, a helmet or a wet shell on the outside.
- Compression straps on both sides — these are what let a half-full pack still carry well.
- A lid that converts to a daypack or sling — worth having on any pack above 50 litres, because it saves carrying a second bag for summit days.
- A base that stands up on its own — a flat, reinforced base means you can load and unload without the pack falling over.
Two things are usually missing on cheap packs and are hard to add later: bartacks at every strap anchor, and a double-stitched hipbelt attachment. Those are the points that fail first under load.
Men’s and women’s fit: what actually changes
A women’s specific pack is not a men’s pack in a different colour. Three things change: the back length is shorter and adjustable over a shorter range, the shoulder harness is narrower and set closer together so it does not press across the chest, and the hipbelt is conical rather than straight, with more padding, to sit on a proportionally wider hip and narrower waist.
If your torso is under about 46 cm or your shoulders are narrow, a women’s specific pack will fit better regardless of your gender. If your torso is long and your shoulders broad, a unisex pack is the right choice. The eight-pack comparison in best hiking backpack for women shows the differences in practice, including packs that adjust across both fits.
The try-before-you-buy checklist
Load the pack with 10 to 12 kg and wear it for at least fifteen minutes, ideally walking up and down stairs. Then check these seven points in order:
- The hipbelt padding is centred on your hip bones, with no gap at the front and no pressure on the stomach.
- The shoulder straps curve over your shoulders and touch along their whole length, with no gap at the top of the shoulder.
- The load lifters sit at roughly 45 degrees and are not maxed out.
- The sternum strap sits across the upper chest, not the throat, and you can slide a hand under it.
- The pack does not rock when you twist your torso, and does not pull you backwards when you lean forward.
- Nothing hard presses into your spine or shoulder blades through the back panel.
- With the pack on, you can look up without the top lid hitting the back of your head.
If any of these fail, change the size rather than the strap settings. A pack that needs every strap at its limit to fit is the wrong pack.
How should you load a hiking backpack?
A well-loaded pack carries several kilos lighter than a badly loaded one of the same weight, because the load sits where your body can support it rather than where it pulls you off balance.
- Heaviest items against your back and between your shoulder blades — that is the point closest to your centre of gravity, so the pack resists swinging.
- Medium-weight items at the bottom, light items at the top and outside — a heavy item high up raises your centre of gravity and makes descents unstable.
- Sleeping bag at the very bottom in its own compartment, because it is light for its volume and you do not need it during the day.
- Frequently used items in the lid and hipbelt pockets — a shell, a hat, a snack, a headtorch. Every stop you avoid is energy saved.
- Water low and central, ideally in a hydration bladder against your back, because water is the densest thing you carry.
- Nothing dangling — loose straps and a swinging bottle cost more energy over a day than most people realise.
Load the pack so that it stands upright on its own before you put it on. If it flops forward or backward, the heavy items are in the wrong place. The full sequence, including how to compress a partly filled pack, is in how to pack a hiking backpack.
What pack weight should you aim for?
A common rule is to keep total pack weight under 20% of your body weight for comfortable multi-day hiking, and under 25% at the upper limit. For a 70 kg hiker that means 14 kg comfortable and 17.5 kg as a ceiling. Ultralight hikers work down to 10% or less, but that requires replacing most of your kit, not just buying a lighter pack.
The pack itself should be roughly 8-12% of your total load. If your total is 14 kg, a 1.2 to 1.7 kg pack is in proportion. Buying a 900 g pack to save weight only makes sense if the rest of your kit is already light, because an overloaded light pack transfers the load straight to your shoulders and is more tiring, not less.
Weigh everything once, including food and water, and write it down. Most hikers overestimate how light their kit is by two to three kilos. For the wider case for carrying a pack well, see benefits of using a backpack.
Five mistakes that make a pack carry badly
- Buying for the biggest trip instead of the usual trip. An oversized pack collapses on short trips and every compression strap ends up doing structural work.
- Choosing by height instead of torso length. Two hikers of the same height can need different sizes, and the wrong size cannot be fixed with strap adjustment.
- Wearing the hipbelt on the waist. The belt must cup the iliac crest. On the waist it slides down under load and the shoulders take everything.
- Ignoring the empty weight. A 2.8 kg pack that carries well beats a 1.9 kg pack that flexes, but neither beats a correctly sized 1.5 kg pack.
- Skipping the loaded test. A pack feels fine empty and behaves completely differently with 12 kg in it. Fifteen minutes on stairs will reveal every problem.
Does the terrain change what you need?
Yes, and it changes the frame and the harness more than the volume.
- Rock and scree — a stiffer frame and a higher-denier base panel. A soft pack rolls on uneven ground and the base wears through in a season.
- Bushwhacking and scrub — ripstop fabric with a grid, no exposed mesh pockets, and straps that tuck away so they do not snag.
- Snow and ice — lash points for an ice axe and a helmet, a lid that takes a rope, and a hipbelt that works with gloves on.
- Long exposed ridgelines — a suspended mesh back for heat and a low profile so the pack does not act as a sail in wind.
- Wet climates — a pack liner rather than a cover, because a cover only protects the outside. See benefits of a waterproof backpack.
The terrain you actually hike should decide between two packs you are otherwise torn between. Buy for the ground under your feet, not for the brochure.
What buyers should ask a backpack manufacturer
If you are sourcing hiking backpacks rather than buying one, the specification conversation is different. Four questions separate a supplier who understands load carriage from one who only sews panels:
- What is the frame material and how is it anchored? A stay that ends in a plastic pocket will punch through within a season. Ask for the anchor detail, not just the stay diameter.
- What is the yarn tenacity, not just the denier? 210D high-tenacity nylon and 210D standard nylon behave very differently under abrasion.
- How is the hipbelt attached? Double-stitched and bartacked at the four load points, or single-stitched with a binding tape.
- What is the inspection standard? AQL 2.5 across the full order, with the frame and strap anchors called out as critical defects.
Our sampling runs 6-10 days and bulk production 35-50 days, with a minimum of 500 pieces per style and colourway, FOB Xiamen. Below 500 pieces the pattern and frame tooling is not economic, because the harness has to be re-cut for each torso length. More on our capability is at custom backpack manufacturer.
Frequently asked questions about choosing a hiking backpack
How do I choose a hiking backpack?
Match three numbers before you look at features: volume to your nights out, torso length to your own spine, and empty weight to what you are willing to carry. A 20-litre pack covers a day hike, 30-45 litres one to two nights, and 55-65 litres three to five nights. Torso length decides the size rather than your height, and the hipbelt must sit on the iliac crest so that about 80% of the load travels through your hips.
What size hiking backpack do I need?
Base it on trip length, not on body size. 15-20 litres for a day hike, 20-30 litres for a long day, 30-45 litres for one to two nights, 45-60 litres for three to five nights, and 60-75 litres for five nights or more. A cold-weather sleep system, a camera or several days of food can add 15-20 litres. If you are between sizes, take the smaller pack, because a compressed 45-litre carries better than a half-empty 60-litre.
How do I measure my torso length for a backpack?
Tilt your head forward and find the most prominent vertebra at the base of your neck, then find the top of your hip bones at the back and imagine a line between them. Measure the straight distance between the two points. Under 43 cm is a short torso, 43-48 cm is regular, and over 48 cm is long. Torso length, not height, decides your pack size, which is why two people of the same height can need different sizes.
What is the difference between an internal and external frame backpack?
An internal frame puts the stays inside the pack body close to your back, keeping the load tight to your centre of gravity, which is better on uneven ground and narrow trails. An external frame puts the structure outside, which gives better airflow and lets you carry awkward heavy items, but raises the centre of gravity, which works against you on descents and side slopes. Internal frames are the default for hiking.
How much should a hiking backpack weigh empty?
A 20-litre daypack should weigh 0.5-1.0 kg, a 40-litre pack 1.2-1.8 kg, a 60-litre pack 1.6-2.3 kg, and a 75-litre expedition pack 2.5-3.5 kg. Below these figures you are usually trading durability or frame stiffness for weight. Above them you are paying for features you may not need. Weigh the empty pack before buying, because the difference compounds over a full day.
What denier fabric should a hiking backpack be?
100-210D high-tenacity nylon is the sweet spot for the main body, with 420-500D on the floor and lower panels where abrasion is heaviest. Denier measures yarn thickness, not quality: a 100D high-tenacity nylon can outperform a 600D low-grade polyester because tenacity and weave matter as much as thickness. Ask for the yarn tenacity, not just the denier number.
How do I know if a backpack fits properly?
Load it with 10-12 kg and wear it for fifteen minutes. The hipbelt padding should be centred on your hip bones with no gap at the front, the shoulder straps should touch along their whole length, the load lifters should sit at about 45 degrees, and the pack should not rock when you twist or pull you backwards when you lean forward. If any of these fail, change the size rather than the strap settings.
What is the best backpack for a day hike?
A 20-30 litre pack with a light internal frame or a framesheet, a ventilated back panel and a hipbelt wide enough to take some weight. Under 30 litres a full frame is unnecessary weight, but a completely frameless pack only works below about 9 kg total load. A hydration sleeve with a hose port matters more on a day hike than on a multi-day trip, because you drink more often.
Do I need a rain cover for my hiking backpack?
It helps but is not sufficient on its own. Most pack fabric is water-resistant rather than waterproof, and a cover protects the outside while leaving seams and the base exposed. In sustained rain a pack liner inside the main compartment keeps your kit dry even if the shell wets out. If you hike in heavy rain regularly, use both.
How do I stop my backpack from hurting my shoulders?
Shift the load to your hips. Fasten the hipbelt first and tighten it until it is firm over your hip bones, then adjust the shoulder straps so they curve without gapping, then set the load lifters at about 45 degrees. If the shoulders still hurt, the torso length is probably wrong, the hipbelt is sitting on your waist instead of your hips, or the pack is overloaded for its frame.
What is the MOQ for custom hiking backpacks?
500 pieces per style and colourway, with sampling at 6-10 days and bulk production at 35-50 days, FOB Xiamen. Below 500 pieces the pattern and frame tooling is not economic, because the harness has to be re-cut for each torso length. Custom work covers frame type, harness geometry, fabric and denier, colourway and branding.
How long does it take to sample a custom hiking backpack?
6-10 days for a first sample and 35-50 days for bulk after approval. The critical path is the harness rather than the body panels: the bartacks at the strap anchors, the hipbelt curvature and the back-panel foam density are what get re-cut between rounds. AQL 2.5 inspection is standard, with frame and strap anchors treated as critical defects.
