10 Best Adjustable Torso-Length Backpacks

10 Best Adjustable Length Backpacks

Adjustable length backpacks let you change the torso length of a backpack so it does a better job of transferring weight from the shoulders to the hips. Traditionally, backpack companies have dealt with torso length by forcing you to choose between small, medium, or large frame heights which may or not fit you well. If a backpack frame is too short, all the weight will ride on your shoulders and make them sore. If it’s too long, the backpack will pull away from your back and throw you off-balance. But adjustable length backpacks give you the ability to resize a backpack’s length to match your exact personal measurements. It’s a lot like owning a custom-made backpack that’s made just for you (without having to pay extra for it.)

Here are the 10 best adjustable length backpacks we recommend. See the linked reviews for details about each.

Make / ModelWeightWomen's Specific Model
Osprey Atmos AG 504 lbs 3 ozOsprey Aura AG 50
Gregory Paragon 583 lbs 8 ozGregory Maven 55
REI Traverse 604 lbs 4 ozREI Traverse 60
Six Moon Designs Flight X2 lbs 4 ozNA
Zpacks Arc Blast 55L1 lbs 4 ozNA
Granite Gear Blaze 603 lbsGranite Gear Blaze 60
Osprey Kestrel 483 lbs 9 ozOsprey Kyte 46
Gregory Zulu 553 lbs 9 ozGregory Jade 53
Elemental Horizons Aquilo 752 lbs 13 ozElemental Horizons Aquilo 75
Deuter Aircontact Lite 65+104 lbs 6 ozAircontact Lite 60+10

The torso length adjustment mechanisms on these packs are very easy to understand and use. They’re so simple and lightweight that you have to wonder why all backpacks aren’t adjustable to eliminate the fit problems that so many people experience when buying new backpacks.

1. Osprey Atmos AG 50 Backpack

Osprey Atmos AG 50

The Osprey Atmos AG 50 is one of the most comfortable backpacks ever made with a ventilated “anti-gravity” suspension system. Featuring a lightweight, yet rigid frame, this 9-pocket top loader has an adjustable torso and hip belt, ensuring a personalized fit. You can adjust the torso length by raising or lowering the shoulder straps to make the hip to shoulder pad distance longer or shorter. The hip belt can also be lengthened a few inches if it’s short by pulling out its side wings. After that, the Atmos AG’s ventilated mesh back panel contours automatically to the body, distributing weight and providing an outstanding fit. A women’s version called the Aura AG 50 is also available. Osprey makes more adjustable length backpacks than any other pack manufacturer. It’s why so many people use their packs. Read our Review.

Check for the latest price at:
Osprey | REI | Amazon

2. Gregory Paragon 58 Backpack

Gregory Paragon 58 Backpack

The Gregory Paragon 58 is a lightweight ventilated backpack designed to fill the void between minimalist ultralight backpacks and the monster capacity backpacks that Gregory is known for like the Denali 100 or the Baltoro 75. Weighing 3 lbs 8 oz, the Paragon 58 has an adjustable length torso and adjustable length hip belt. The Paragon fits men with a torso length of 15-22 inches and is available in multiple volumes. A women’s version called the Maven 55 is also available. Read our review.

Check for the latest price at:
REI | Backcountry | Amazon

3. REI Traverse 60 Backpack

REI Traverse 60

The REI Traverse 60 Backpack is a multi-day ventilated backpack with an adjustable-length frame so you can get a custom fitting pack that matches your unique size for optimal comfort. The torso length on the Traverse 60 can be adjusted by lifting or lowering the shoulder yoke, which is attached to the back of the pack by velcro. When you buy a pack designed to carry heavier loads, this is a must-have. Loaded with pockets and features, the Traverse compares quite favorably to the other premium packs in terms of features, pack weight, and price. The women’s-specific version is also called the REI Traverse 60.

Check for the latest price at:

4. Six Moon Designs Swift X

Six Moons Swift X
The Six Moon Designs Swift X is a 45 liter adjustable length backpack that weighs 36 oz. Available in XPac or LiteSkin (which we’d recommend since it’s even more abrasion resistant). It has a durable stretch Lycra front pocket and side water bottle pockets, solid hip belt pockets, and a removable Delrin frame stay. Six Moon Designs is one of the few lightweight pack makers to provide vest-style shoulder straps as an option as well as multiple hip belt lengths so you can dial in a great fit. Read our Swift X backpack review.

Check out the latest price at:
Six Moon Designs

5. Zpacks Arc Blast 55

Zpacks Arc Blast Backpack

The Zpacks Arc Blast is a 55-liter DCF pack from one of the original ultralight backpack brands. This is a terrific option for hikers who want the ventilation of suspended mesh while still opting for an ultralight pack. This has an easily adjustable torso to ensure a precise fit, and the proprietary external frame provides stellar weight distribution. Zpacks has experienced some durability issues over the past several seasons, which is something to keep in mind when considering the lifespan of the pack. You can also go for the Zpacks Arc Haul, a 62L pack, but we chose the Arc Blast for the waterproof DCF construction. The Zpacks Arc Blast has a recommended weight limit of 35 pounds. Read the SectionHiker review.

Check for the latest price at:

6. Granite Gear Blaze 60 Backpack

Granite Gear Blaze 60

The Granite Gear Blaze 60 is a great multi-day backpack with a roll top-style top, with an optional top lid. The torso length is adjustable by raising the shoulder yoke higher or lower on the frame sheet. The mechanism is quite simple to understand and there’s little chance of the shoulder straps slipping if they’ve been inserted properly. The hip belt length is also fully adjustable, which is a rare feature found on very few backpacks.  A women’s Blaze 60 with gender-specific shoulder straps and a hip belt is also available. Read our Review.

Check for the latest price at:
REI | Backcountry | Amazon

7. Osprey Kestrel 48 Backpack

Osprey Kestrel 48
The Osprey Kestrel 48 is a multi-purpose backpack that’s big enough for weekend backpacking trips, but nimble enough for peakbagging and day hiking. It uses Osprey’s Airscape adjustable length frame, which is lightly ventilated and has a simple velcro mechanism that lets you raise or lower the shoulder strap yoke to adjust the length of the torso. A women’s version is also available called the Osprey Kyte 46. Read our Review.

Check for the latest price at:
Osprey | REI  | Amazon

8. Gregory Zulu 55 Backpack

Gregory Zulu 55

The Gregory Zulu 55 is a ventilated and adjustable torso length backpack that rivals the Osprey Atmos 50 in comfort. This multi-day, top-loading backpack comes with front panel access and a sleeping bag pocket for easy gear access and organization. The pre-curved hip belt has large pockets capable of holding a smartphone or other trail essentials, while the new perimeter wireframe provides a lively and responsive carry. A rain cover is included. See the women’s Jade 53 for the gender-specific version of this comfortable backpack. Read our Review.

Check for the latest price at:
Backcountry | Amazon

9. Elemental Horizons Aquilo 75L Backpack

Elemental Horizons Aquilo 75 Backpack

The Elemental Horizons Aquilo 75L Backpack is the perfect pack for pocket lovers with 5 external pockets (not counting hip belt pockets) that let you store lots of oversized gear that won’t fit in most mainstream backpacks. It’s also astonishing lightweight for its size weighing just 45 oz (2 lbs  13 oz) with a maximum recommended load of 45 lbs. It has three tiers of side compression straps, a fully adjustable torso length, and is available in five hip belt sizes. A women’s Aquilo 75L backpack is also available.  Read our review.

Check for the latest price at:
Elemental Horizons

10. Deuter Aircontact Lite 65+10 Backpack

Deuter Aircontact Lite 65+10 Backpack

The Deuter Aircontact Lite 65+10 is a multi-day backpack that can go big when you have to carry a lot of gear and supplies. It has an easy-to-adjust shoulder yoke system so you can dial in the preferred torso length. A separate bottom compartment with zippered divider holds your sleeping bag, while the floating top lid can be raised when you need to use the extension collar or carry extra gear. The S-shaped shoulder pads and a pre-curved hip belt provide excellent comfort, while cushy mesh-covered foam provides all-day comfort. The Aircontact Lite is available in multiple volumes. The women’s model is called the Aircontact 60 + 10 SL. Read our review.

Check for the latest price at:
REI | Backcountry | Amazon

How to Choose a Backpack

What are the most important features to consider when choosing a backpack? How important is pack weight and getting a frame or hip belt that can be adjusted to fit your personal dimensions? What is the difference between a unisex and a gender-specific backpack and why would you pick one over the other? We answer all of these questions below, and many more.

Backpack Sizing

The two most important backpack sizing variables are your torso length and the circumference of your hips. Torso length is not the same as your height but measures the distance between the top of your hip bones and the C7 (bulging) vertebrae on your neck. Tall people can have short torsos and short people can halve long torsos, so it pays to measure this correctly. Hip size is not the same as waist size or pant size and should also be measured separately. Measure the circumference of your body over your hip bones, where a hip belt should rest. Do this while wearing the clothes you expect to hike in. A cloth tape measure is the best thing to use for measuring both of these numbers.

Adjustable Length Torsos and Hip Belts

The majority of backpacks have fixed torso lengths and hip belt sizes, which can make getting a good fit difficult because people’s body shapes and proportions vary so much. Some premium packs let you adjust the length of these components so you can get a personalized fit. While they generally weigh a bit more, getting a well-fitting backpack is usually worth it.

Gender-Specific Sizing

Men and women have very different anatomical needs when it comes to fitting a backpack. Men tend to be taller and broader across the shoulders with squarish hips, while women have bosoms and curvier hips. Some backpack manufacturers make shoulder pads and hip belts that are gender-specific and address these differences. For example, many backpacks have J-shaped shoulder straps and sternum straps designed for men that crush female breasts. Most women prefer an S-shaped shoulder strap that curves around their chest and is more comfortable. The same holds for hip belts.

Backpack Volume

A 6o liter backpack is the sweet spot for most thru-hikers, weekend backpackers, and multi-sport adventurers because it gives you plenty of space for food, fuel, and gear. While you can go lower and higher, this is a good place to start looking, since many packs are available in smaller and larger volume models. When evaluating a backpack, it’s important to find out how the manufacturer calculates its pack volume. Some manufacturers only count closed storage while others add in all of the open pockets too. That can lead to an inflated number that you’ll regret when it starts pouring rain.

Ventilated Backpack Frames

Everyone sweats when they carry a loaded backpack. So many people prefer buying packs with ventilated frames that leave an air gap between your back and the pack to help dry your shirt faster. It’s a comfort thing.

Backpack Frames

There are basically four types of backpack frames. The one you choose will be dictated by the amount of weight you need to carry.

  • Rigid perimeter frames that are internal (hidden) or external and can hold the most weight. These are required if you want a backpack that has load lifters.
  • Frame stays, which are metal rods inside a backpack to keep it from collapsing on itself and prevent objects from poking you in the back. They are very lightweight and good for moderate gear loads. They can usually be removed and bent to match your back shape.
  • Thin and flexible plastic frame sheets that are sewn into the back of a pack, but are not removable. They hold the least weight.
  • External frames that are visible on the exterior of the backpack. They’re found on backpacks designed to carry heavy loads. They’re convenient for carrying awkwardly large gear because you can lash it to the frame and don’t have to carry it inside the pack bag.

Pockets and Organization

Different people have different styles of packing needs. Some prefer lots of pockets for organizing their gear and others don’t. Some people prefer using a hydration bladder and others prefer using water bottles, as long as they’re reachable while wearing the backpack.

External Attachment Features

Gear can be carried inside a back or attached to the outside using webbing straps or elastic cord. If you have to carry bulky or awkwardly shaped gear like a foam pad, a large tent, a packraft, paddle, snowshoes, trekking poles, an ice ax, or bear canister, it pays to get a backpack that has special straps or places that you can attach gear to.


If you plan to hike in tough desert or mountainous terrain or off-trail, it’s best to get a backpack that has as little external mesh (pockets) as possible, because these are usually the first things to get ripped up on a backpack. Zippers can also be a point of failure. Some fabrics are also thicker and tougher than others. When comparing fabric durability, those with higher denier counts (100D vs 210D) tend to be most abrasion and puncture resistant.

Check Out All of SectionHiker's Gear Guides!

Editor's note: If you’re thinking about buying gear that we’ve reviewed or recommend on SectionHiker, you can help support us in the process. Just click on any of the seller links above, and if you make a purchase, we may (but not always) receive a small percentage of the transaction. The cost of the product is the same to you but this helps us continue to test and write unsponsored and independent gear reviews, beginner FAQs, and free hiking guides. Thanks and we appreciate your support!

Leave a Reply

Your email address will not be published.