
The Osprey Atmos AG 50 is a backpack designed for multi-day hikes and camping trips. It has a capacity of 50 litres and features a dedicated sleeping bag compartment, which can be separated from the main compartment using a removable divider. The Atmos AG 50 also features a floating top lid, which can be raised or removed to accommodate bulkier items, and multiple pockets for gear and water bottles. The backpack is designed with comfort in mind, featuring Osprey's AntiGravity suspension system, which provides a weight-defying fit that contours to the wearer's back and hips.
| Characteristics | Values |
|---|---|
| Capacity | 50L |
| Fit | Custom fit, weight-defying, 3D-suspended mesh |
| Comfort | Very comfortable, unbeatable comfort |
| Storage | Main compartment, sleeping bag compartment, two lid pockets, two hip belt pockets, one large stash pocket, two water bottle pockets, mesh front pocket |
| Additional Features | Removable top lid, zippered sleeping bag compartment, removable sleeping pad straps, internal hydration reservoir sleeve, Stow-on-the-Go trekking pole attachment, rain cover, FlapJacket for lidless use |
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What You'll Learn

Sleeping bag compartment
The Osprey Atmos AG 50 backpack features a conventional organisation of a top lid, main compartment, side pockets, and an optional sleeping bag compartment. The sleeping bag compartment is located at the base of the backpack and can be accessed through an external zipper. The compartment can be created by deploying an optional fabric shelf that attaches to webbing loops inside the pack. When not in use, the fabric shelf can be folded back to utilise the main compartment as one large storage space.
The sleeping bag compartment is designed to provide efficient storage and quick access to the sleeping bag or other gear. However, some users have expressed that the dedicated sleeping bag compartment is unnecessary and can lead to uneven packing and wasted space. They prefer to store their sleeping bags in the main compartment, encapsulated in a waterproof sack or a trash compactor bag.
The Atmos AG 50 backpack also offers versatility in attaching a sleeping pad. While the backpack does not feature tie-down points at the bottom, users have suggested mounting the sleeping pad by utilising the gear loops, compression straps, or ice axe loops. Alternatively, the sleeping pad can be stuffed between the brain (top lid) and the normal pack closure, or bungeed to the top of the lid.
The Atmos AG 50 backpack is designed to provide a comfortable and custom fit, with features such as AntiGravity suspension and a weight distribution system that ensures the weight is held by the waist belt. The backpack also includes side zippers for easy access to the main compartment and an integrated raincover to protect your gear from the weather.
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Sleeping pad straps
The Osprey Atmos AG 50 backpack is a popular choice for camping and hiking enthusiasts. It features a spacious 50L capacity, exceptional comfort, and a range of compartments for organised packing. However, one common challenge that users face is mounting their sleeping pads due to the absence of tie-down points on the bottom of the bag.
There are several methods and workarounds that users have suggested to secure a sleeping pad to the Atmos AG 50 backpack:
- Side-mounting: Some users prefer to side-mount the sleeping pad under the compression straps. This method may require additional modifications, such as sewing on custom straps or loops to the bottom of the pack.
- Using gear loops: The Atmos AG 50 features gear loops at the back, which can be utilised to hang the sleeping pad.
- Stuffing between the brain (top lid) and pack closure: The sleeping pad can be stuffed between the brain (top lid) and the normal pack closure. This method may require additional securing with bungees or paracord.
- Utilising ice axe loops: By rigging shock cords to the ice axe loops, the sleeping pad can be wrapped and secured. This positions the pad away from the internal frame of the pack.
- Osprey's newer 2018 version: If you're open to purchasing a newer model, Osprey introduced bottom straps specifically for attaching a sleeping pad or tent in the 2018 version of the Atmos AG 50.
Additionally, some aftermarket sleeping pad straps can be purchased separately and attached to the sleeping pad to provide additional functionality:
- Zpacks Ultralight Sleeping Pad Strap: This strap is designed to keep two sleeping pads lashed together side by side, effectively creating a two-person sleeping pad. It features adjustable buckles and depth between the pads for a secure attachment.
- Enlightened Equipment Elastic Pad Straps: These replacement pad straps are designed for use with Enlightened Equipment quilts and come in various widths to accommodate different pad sizes. They include a Loop Strap that goes around the pad and a Flat Strap that goes between the user and the pad.
- UGQ Outdoor Ultralight Pad Strap: This strap helps keep your top quilt on your pad by installing a continuous loop near the top third of the sleeping pad. It uses toggles on elastic cords that insert into the pad attachment loops on the quilt for a secure fit.
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Backpack size
The Osprey Atmos AG 50 backpack is a 50-litre pack that is designed for multi-day hikes and trips. It is known for its comfort and fit, with some users claiming it fits like a glove. The Atmos AG 50 has a conventional organisation system, with a top lid, main compartment, side pockets, and an optional sleeping bag compartment. The sleeping bag compartment has a zipper, but some reviewers have noted that this is pointless if you are using a waterproof pack liner bag. The newer 2018 version of the bag has bottom straps for a sleeping pad or tent, while the older version does not.
The Atmos AG 50's top lid has two zippered pockets, with the bottom pocket larger than the top one, suitable for storing extra gloves, hats, or snow goggles. The top pocket is smaller and can be used to store items like a map, compass, or GPS. The top lid is floating, meaning it can be raised above the main compartment by lengthening the webbing straps, which is useful if you need to wedge gear between the lid and the main compartment. The lid can also be removed to reduce weight, although this means you will need to use the Flap Jacket, a fabric flap that covers the top of the main compartment to prevent rain from entering.
The main compartment has an internal hydration pocket and hang loop, with a central hydration port that comes out at the top of the pack between the wearer's shoulder blades. There is also an optional fabric shelf that can be deployed to create a separate sleeping bag compartment at the base of the bag. The Atmos AG 50 also has a mesh shovel pocket on the rear, which is good for storing items like a climbing helmet, wet items, or extra layers that you want to access quickly.
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Backpack comfort
The Osprey Atmos AG 50 backpack is designed with comfort in mind. It provides a custom fit for unbeatable comfort, fitting like a glove and leaving users wondering where all the weight went. The bag is described as feeling like your back was measured by the factory, with one experienced hiker commenting that it is the most comfortable backpack they have ever used. The bag is also very spacious, with users noting that it holds a large amount of stuff.
The Atmos AG 50 has a conventional organisation with a top lid, main compartment, side pockets, and optional sleeping bag compartment. The main compartment has an internal hydration pocket and hang loop, with a central hydration port that comes out at the top of the pack between your shoulder blades. The top lid has two zippered pockets, with the larger bottom pocket good for storing extra gloves, a hat, or snow goggles, and the smaller top pocket good for storing a map, compass, or GPS. The top lid can be raised above the main compartment by lengthening the webbing straps, allowing for more gear to be wedged between the lid and the main compartment. The top lid can also be removed, reducing the pack weight by 5.5 ounces, and replaced with a Flap Jacket to prevent rain from entering the main compartment.
The Atmos AG 50 also features an integrated raincover, AntiGravity suspension, and a Stow-on-the-Go trekking pole attachment. The bag is constructed with 100% recycled materials.
When it comes to backpack comfort, there are several factors to consider. Firstly, fit is crucial. A backpack should fit well and distribute weight properly, with a load transferring harness that loads about 80% of the weight onto the hips. It is important to try on different backpacks and compare what is most comfortable, considering factors such as volume, dimension, weight limits, and whether you will be travelling with a laptop. Shoulder straps and padding are also important for comfort, as well as compression straps to keep the bag snug against your body and prevent items from sliding around.
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Backpack pockets
The Osprey Atmos AG 50 backpack has a conventional organisation system, with a top lid, main compartment, side pockets, and an optional sleeping bag compartment. The main compartment has an internal hydration pocket and a hang loop, as well as a central hydration port that comes out at the top of the pack, between the wearer's shoulder blades. There is also an optional fabric shelf that can be deployed to create a separate sleeping bag compartment at the base of the bag. This fabric shelf can be folded back when not in use, allowing the user to utilise the main compartment as one large storage space. The Atmos AG 50 also features a mesh shovel pocket on the rear of the pack, which is open at the top but secured with a buckle. This pocket is ideal for storing items that the wearer may need quick access to, such as a climbing helmet, a water filter, or extra clothing layers.
The top lid of the Atmos AG 50 features two zippered pockets. The bottom pocket is larger and suitable for storing bulkier items such as gloves, a hat, or snow goggles. The top pocket is smaller and better suited to smaller items such as a map, compass, or GPS device. The top lid can be raised above the main compartment by lengthening the webbing straps that connect it to the top of the pack. This feature allows the wearer to fit more gear between the lid and the main compartment. The lid can also be removed entirely, reducing the weight of the pack. Osprey offers an alternative lid called the Flap Jacket, which is a simple fabric flap that covers the top of the main compartment to protect it from rain, but does not feature any pockets.
The Atmos AG 50 also features stretch mesh side pockets that can hold water bottles, and an external zipper that allows access to the sleeping bag compartment. The backpack also has gear loops on the back, and compression straps on the sides. Some users have noted that the sleeping pad does not have tie-down points at the bottom, and have suggested side-mounting it under the compression straps, or hanging it from the gear loops.
The Atmos AG 50 also has belt pouches, which are roomy and easy to access. These pouches can be clipped securely onto a padded belt, and are suitable for storing items such as a headlamp, folded maps, snacks, gloves, and gadgets.
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Frequently asked questions
The Osprey Atmos 50 has a capacity of 50L.
The Osprey Atmos 50 has one main compartment and an optional sleeping bag compartment.
The Osprey Atmos 50 has nine pockets, including two lid pockets, two hip belt pockets, one large stash pocket, and two water bottle pockets.
While the exact weight capacity is not specified, the Atmos 50 is designed for lightweight multiday-overnight trips. One reviewer reported a pack weight of 28 pounds for a short overnighter.
Yes, the Osprey Atmos 50 has an integrated raincover to keep your gear dry in wet weather.











































