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Osprey Mens Atmos AG 50 Rigby Red

Osprey Mens Atmos AG 50 Rigby Red

£126.00 £180.00
30% off

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Other colours available:
Osprey Mens Atmos AG 50 Abyss Grey
Osprey Mens Atmos AG 50 Unity Blue

The Atmos 50 AG uses a revolutionary carrying system that moulds to your back, provides immense ventilation and distributes the pack weight across the entire system. A breakthrough in backpacking comfort.

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Season : Sale

Code : 5-100-2

Weight : 0KG

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What is the Atmos AG 50

The Atmos AG 50 is designed around Osprey’s unique AG Anti-Gravity backsystem that features the world’s first fully ventilated hipbelt. It is the perfect pack for those who can manage with less kit, or who are going on shorter adventures. The Atmos AG 50 is perfect for trekking and backpacking in hotter climates or, for that matter, pretty much anywhere in the world. Packed with innovative and genuinely useful features the Osprey Atmos AG 50 will make your life more comfortable and more breathable on treks or worldwide travel adventures.

What is it made from?

The Osprey Atmos AG 50 is built to handle the rough and tumble of life on the trail, and even those notorious baggage handlers. Made using tough and durable nylon fabrics to ensure it can soak up the bumps and scrapes of an extreme life. The main bulk of the bag is made from 100D x 630D Nylon Dobby with a durable water-repellent finish to keep your kit dry during light rain (a rain-cover is included for heavy downpours). Extra reinforcing elements across the body of the pack are made from 210D High Tenacity Nylon, whilst the base gets the super-tough 420HD Nylon Packcloth, as this area bears the most abuse.

What is the back-system?

The Osprey AG Anti-Gravity backsystem is a work of art and provides uncompromising ventilation and support. Made up of four main components that act together to provide unparalleled comfort.

ANTI-GRAVITY SUSPENSION - Supporting everything is a LightWire, fully tensioned, peripheral frame that provides masses of support, transfers the load to your hips and flexes and moves with you for maximum comfort.

ANTI-GRAVITY BACKPANEL - The main contact area, from top to bottom, is made from a sprung mesh to create an air gap between you and the pack itself. This mesh seamlessly wraps your shoulders, back and hips for a fully integrated and ventilated backpanel fit.

ANTI-GRAVITY MESH HARNESS - The shoulder harness continues the padded and ventilated theme and can be adjusted to suit your torso length by a simple cam-buckle arrangement. Structural LoadLifter bars at the top of the straps really help to spread the load and take the weight off your shoulders and a sternum strap (with built in whistle) helps to balance the weight evenly and increases comfort. 

ANTI-GRAVITY HIPBELT – The suspended mesh theme continues through the padded hipbelt which wraps closely around your hips for optimal weight transfer and comfort. Featuring a Fit-on-the-Fly adjustment, the hipbelt can be adapted to suit your body perfectly, ensuring the structural fins are in the most efficient position.

All of this amazing technology combines to give the Atmos AG 50 a suggested load range of 13-22kg, but you’ll hardly notice you’ve got it on as the backsystem does such a good job of suspending the load and transferring the weight to your hips and away from your shoulders.

Available in two different back lengths:

Medium = 46-53cm

Large = 51-58cm

Please remember that your torso length and not your height will determine the back length. For example, I’m 191cm tall, yet only have a 47cm torso length, so I’d go for a Medium size in this pack. For more advice on pack fitting have a look at our video below.

What are the features?

It isn't just the lightweight, ventilated comfort and support that we love about the Atmos AG 50, we also love the attention to detail and the huge number of clever, useful and unique, features. So, let’s start up at the top and work our way down.

The main entry point is through a traditional double-clip lid opening to give easy access to the pack’s contents. The top lid is extendable to provide extra storage by extending the internal valance, or it can be completely removed if you want to strip the Atmos down for lighter use.

Once the top lid is removed you can use the “FlapJacket” top cover to create a secure closure. A simple drawcord seals up the top entrance and there’s a compression strap across the opening to keep the load balanced or the pack closed when the lid is removed.

The main compartment can also be split in two using the built-in divider; this creates a separate base compartment for wet or dirty kit, or to simply organise your pack more effectively. The base compartment can be accessed via a large zipped entrance at the bottom of the pack.

Inside the main compartment is a hydration sleeve with a little clip to stop the bladder from drooping down to the bottom of the sleeve. This is the perfect place to pop your Osprey Hydraulics reservoir.

Osprey equip the Atmos AG 50 with a dual ice-axe loops, which can be tucked away to stop them catching on things. You also get the unique “Stow-on-the-go” trekking pole attachment system. This allows you to safely stash your trekking poles away when they are no longer required without having to remove the pack or pester a mate to do it for you.

Four side compression straps pull the weight closer to your back, increasing comfort and carrying efficiency; they also stop gear from rolling about in a half full pack. The two at the bottom of the pack are linked directly to the hipbelt and really help to lock and stabilise the load on uneven terrain or if you’re carrying heavier loads.

Two further straps at base of the pack can be used for storing sleep mats or extra clothing; or can be completely removed if you just don’t need them.

All this compression means that even if the Atmos is virtually empty, the load will always be secure and balanced.

Starting from the top, pockets wise, you get a small zipped top lid pocket, that contains a handy key clip and the raincover. This cover is tethered to stop it flying away in the wind, or it can be completely removed to shed a bit of weight in good weather. The cover fits snugly over the front of the pack and is held firm with an elastic drawcord. You get an enormous external zipped lid pocket which is perfect for quick access to kit that you need to get to easily, such as snacks and navigation equipment.

Two tough and stretchy side pockets will swallow 1 litre water bottles or spare clothing and feature a tougher fabric to stop the mesh from being damaged by abrasion. The really nice thing about these pockets is the dual entry, there’s a forward-facing entrance at the base and a regular opening at the top. This means that you can easily load and unload water bottles whilst wearing the pack without having to dislocate your shoulder.

There are two large 3D zipped pockets on the hip belt that float over the main hip belt so you can still gain access to even when the hip-belt is done up tight

On the front of the there is a large stash pocket, the perfect place to store soggy waterproof clothing or even a wet flysheet.


The Atmos AG 50 features one of the most technologically advanced backsystems for comfortable, stable and ventilated load lugging. Use it for multi-day wilderness backpacking, world travel, exploration in remote areas or for when you just need to carry a load of kit off the beaten track.

  • Adjustable torso length
  • AG AntiGravity 3D suspended mesh backpanel/hipbelt
  • Base zip entry
  • Compatible with Hydraulics and Hydraulics LT Reservoir
  • ExoForm/BioStretch harness with load lifter 'bar'
  • Fit-on-the-Fly adjustable hipbelt
  • FlapJacket top cover for use without lid
  • Integrated & detachable raincover
  • Internal hydration sleeve
  • Internal key attachment clip
  • Light weight peripheral frame
  • Removable sleeping pad straps
  • Removable top lid with dual compartments
  • Sleeping bag base compartment with internal divider
  • Sternum strap with emergency whistle
  • Stow-on-the-Go trekking pole attachment
  • Stretch front pocket
  • Stretch mesh side pockets
  • Top lid access
  • Twin compression webbing straps
  • Twin ice axe loops
  • Twin zippered hip belt pockets
Care & Advice

Getting the correct fit for your rucksack is as important as getting the fit right for your boots. A badly fitting pack can inflict misery and discomfort and completely ruin your adventure. This guide is designed to help you get the best fit and comfort from your chosen pack so that carrying all your kit becomes a pleasure and not a chore.


If the pack has an adjustable back length, adjust this to your correct level. Your back length is not related to your height but your torso length. Many packs, and specifically the bigger and more technical packs are available in different back lengths or feature adjustable back systems. Contrary to popular belief, your torso length and not your overall height is the key to getting a well fitted pack. Tall people don’t necessarily have long torsos, just as shorter people don’t always have a short torso length.

Your torso length can be found by measuring from your C7 vertebra (the bony protrusion at the back of your neck when looking down) to the height of your iliac crest (top of your hip bones, where you put your hands on your hips). This measurement will give you an idea of which pack back length to choose.

Once you've got the back length sorted, either by selecting the correct size pack or adjusting the back system, you can begin to follow these simple steps to help achieve a comfortable carry.


Before you start fitting the pack, loosen off all the straps as this will make it easier to get the correct tension later.


Fasten the backpack hipbelt, the general position is the same as where you’d put your ‘hands on hips’ This area is called the pelvic girdle, and what you can feel when you rest your hand on the area is the bony protuberance, the iliac crest. The iliac crest can support the weight from a pack comfortably, and for sustained periods. The padded section of the hipbelt should encompass this and fit securely.

Tighten the straps so the hipbelt feels secure and held firmly around your body. Ensure that the lumbar pad is centered to your lower back to give you maximum support. Remember that your hips carry most of the weight of the pack, so this should be firm but comfortable.


Next, adjust the shoulder straps, pull them until they start to become snug, but ensure that they are not too tight as to lift the pack off your hips. Remember tightening them will stabilise the pack but will increase pressure over the shoulders. If the back length of the pack is correct the shoulder straps will be flush to your shoulders whilst the hipbelt sits in place comfortably. The point where the shoulder straps attach to the main body of the pack should be roughly half way down your shoulder blades; this ensures  that the shoulder straps rolls evenly over the top of your shoulders to distribute the weight correctly.


Fasten the chest strap and pull until taut but not tight, the elastic section should not be extended. This helps keep the shoulder straps from catching in your shoulder joints and keeps the stability of the pack when moving over rough ground.


Top tensioner straps link the shoulder straps to the top of the pack. When tightened, their main function is to stabilise the top part of the pack. The optimum angle for these straps in 45º, but they will stabilise the load even when horizontal or at a more obtuse angle. Tighten them until you feel the top part of the pack rest against your pack, over tightening them will create excessive pressure on the front of your shoulders.


Side tension straps are linked to the hipbelt. By tightening these straps you can stabilise the load but reduce the hipbelt flexibility. Where balance is critical tightening them can help you feel more secure. However, if you are striding out over easy terrain it’s better to loosen these straps to allow full hip flexibility.


Side compression straps come next, pulling these tight does two things: firstly, it stabilises the load, secondly it can lift the lower part of the pack, repositioning the load closer to your back.


Following these steps should give you a comfortable but secure fit on your pack. Sometimes adjustments will need to be made on the go depending on the terrain or the load you are carrying. The perfect fit is very much a personal preference so experiment with different tensions on the pack to find what suits you best.

Technical Information

Fabrics: 100D/630D Nylon Dobby, 210D High Tenacity Nylon, 420HD Nylon Packcloth

Capacity (M) - 50 Litres

Capacity (L) - 53 Litres

Weight (M) – 1.91kg

Weight (L) – 1.95kg

Load Range – 11-18kg

Dimensions (cm’s) – 83h x 38w x 39d

Sizing Information

Back length (M) – 46 - 53cm

Back length (L) – 51 - 58cm

  • 5

    Reviewed by Fiona,  On 16/05/2018 16:42:14

    Beautiful quality rucksack and excellent service from seller. Highly recommended.
    YES Fiona would recommend this item
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    Excellent customer service. Really detailed easy to understand product descriptions on the Trekitt website, and gear reviews on the Trekitt YouTube channel made it so easy to choose the right backpack for me.
    Emily - May 2020
    Amazing service! Very helpful in regards sizing and what most matched my needs, despite this being done over the internet. YouTube videos of products being examined are very useful also. Would definitely use again, very fast and efficient delivery. Brilliant! Highly recommended!
    David R - April 2020
    Highly recommend. I usually go to the shop in Hereford as staff are alwasy very helpful and knowledgeable. So this was the first time I have purchased online and the service was just as good as the shop.
    Grizzy - April 2020


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