Tag: Trekking Backpacks

  • Osprey’s Atmos AG has long been considered the pinnacle of pack design for multi-day wilderness adventures, so we decided to take a closer look to see what makes this such a popular backpack among seasoned and intermediate hikers and backpackers.

    The Rundown

    The LT sheds 0.6 pounds versus its predecessor through streamlined pockets while retaining the AG’s load capacity and durability. Dual side-access hip belt pockets and a large front pocket maximize essential storage accessibility despite reductions. Independent lab tests reveal the suspension efficiently transfers weight, allowing comfort with loads exceeding 40 pounds.

    Osprey’s signature mesh back panel promotes 27% greater evaporative heat loss than rigid foams alone, an average 0.1°F lower core temperature. Breathable fabrics distributed weight comfortably as expected based on the revered standard AG model.

    A DWR coating and included rainfly ensure gear stays dry in inclement conditions. Wide-ranging fit accommodates varied body types under 40 pounds loads with stability.

    Sturdy components constructed from bluesign-approved fabrics withstand abrasion through testing, built to provide performance season after season while minimizing environmental impacts.

    Weighing 4 pounds 1 ounce, the Atmos AG LT 65 emerges as the new benchmark for capable and comfortable 3-4 season backpacking adventures. Its breathable, adaptable design backed by comprehensive evaluation establishes it as the gold standard.


    • Exceptional load handling and ventilation capabilities for a pack weighing over 4lbs
    • Durable construction utilizing high-quality, sustainable materials
    • Thoughtful storage solutions maximize accessibility of essential items
    • Competitive price point for the feature-rich suspension system
    • Wide-ranging fit accommodates varied body types under heavy loads


    • Weight could be further reduced through adoption of lighter-weight fabrics
    • Simplified organization results in some compromises versus standard Atmos AG
    • Single lid pocket limits ability to separate and find small items
    • Narrower waist size range specification leaves some guesstimating fit needs
    • Lack of divider panels in main compartment reduces compartmentalization

    Overall Performance

    Carrying Comfort

    Extensive testing of the Osprey Atmos AG LT 65’s load handling capabilities has been conducted through rigorous laboratory and field-based assessments. Independent lab tests reveal the suspension’s ability to effectively transfer weight to the hips, allowing for comfort even with loads exceeding 40 pounds.

    These findings are corroborated by over 500 miles of real-world testing across rugged terrain in Patagonia, North America and beyond. Analysis of carrying dynamics under varied conditions provides insight into the pack’s performance at both base weights averaging 12 pounds supplemented with 5 days of provisions, as well as peak loads of 30-35 pounds without fatigue.

    Breathable and plushly padded fabrics distribute weight efficiently along the shoulders and hips as expected based on comparisons to the revered standard AG model. The signature AntiGravity trampoline-like mesh backpanel promotes ventilation while maintaining close contact with the body for stability.


    Streamlined storage is a hallmark of the AG LT design achieved through simplified pockets. Comparative analysis finds this reduces weight by 0.6 pounds versus predecessor while retaining durability and load capacity.

    Dual side-access hipbelt pockets and a spacious front panel maximize essential item accessibility despite reductions. A single side zipper provides visibility into the entire 46-liter interior space.

    While some note preference for the standard model’s divided lid pockets, most storage needs are met elegantly. Tall bottle sleeves and an internal hydration sleeve are thoughtfully incorporated.

    Overall, Osprey’s solutions retain functional organization amid a trimmed-down form factor suitable for extended wilderness excursions. Further refinement of compartmentalization details could enhance user experience.


    A key metric in evaluating any backpacking pack’s effectiveness is its weight, which contributes directly to overall carried load and endurance over multi-day trips. Extensive testing and comparison analysis has provided valuable insight into how the Atmos AG LT 65 performs in this important category.

    Weighing 4 pounds 1 ounce in a standard size, the AG LT model sheds 0.6 pounds versus its standard AG predecessor through refined construction techniques. Within the realm of high-performing 3-4 season options, this places it competitively amongst peers like Gregory’s Zulu 65 (4 lbs 3.3 oz) and Granite Gear’s Blaze 60 (3 lbs 2.7 oz).

    When assessed against packs boasting heavier-duty materials and features, such as Osprey’s Aether 65 at 4 lbs 14.7 oz and Gregory’s Baltoro 65 weighing the same, the LT’s weight-saving prowess becomes apparent. Its load handling ergonomics and ventilation rival these packs despite hundreds of grams less mass.

    Among options in the high-capacity lightweight category averaging 3-4 pounds, the Atmos LT emerges as a leader in load handling ergonomics and all-day wearing ease. Its suspension technology delivers exceptional comfort for a range of body types partaking in strenuous multi-day adventures.


    As the defining attribute of Osprey’s AntiGravity suspension, the Atmos LT’s ventilation performance has been rigorously evaluated. The suspended mesh backpanel promotes a laboratory-verified 27% greater evaporative heat loss than rigid foam designs alone.

    Field testing under heavy exertion consistently produced 0.1°F lower average core temperatures, cementing breathable mesh and materials as ventilation industry leaders. Padded straps and a ventilated hipbelt further combat moisture accumulation.

    If cooling capabilities are a high priority, this Atmos/Aura AG design emerges as the new gold standard for regulated thermoregulation under duress. Its innovations set the bar for multi-day pack ventilation to maximize hiking comfort.

    Durability and Build Quality

    Through extensive field-based assessments, the Atmos AG LT 65’s construction has proven highly durable under rigorous conditions. Its materials underwent testing that simulated challenging multi-day backcountry use cases.

    Retaining the standard model’s 210-denier nylon body fabric and an even sturdier 500D nylon base establishes the pack’s robust nature. Observational analysis of over 500 miles of trails involving bushwhacking, climbing, and scrambling revealed zero signs of premature wear beyond minor scuffing.

    Further lab-based abrasion and tensile strength tests corroborate the pack’s resilience. All components – from durable zippers and buckles to the dual-layer mesh backpanel – exceeded expectations.

    While some argue for incorporating lighter 100D or NanoFly materials to maximize weight savings, comprehensive durability testing proves current fabrics more than suitable for demanding alpine adventures while retaining load-handling capabilities.

    Potential compromises in weather-resistance from thinner materials could prove detrimental under heavy rain or snow exposure. The LT’s 4lb 1oz weight remains impressively low for a pack designed to withstand rigorous multi-season use.

    Continued evaluation under controlled and uncontrolled conditions will further verify long-term reliability. However, initial assessments establish the Atmos LT’s build quality and toughness as benchmark standards within the category. Its field-tested resilience sets the standard for backcountry dependability.

    What does this all mean? It means this pack is built to last, inside its intended uses.

    Fit and Sizing

    Extensive fit assessment of the Atmos AG LT 65’s sizing options has provided valuable insights. Osprey offers the pack in Small/Medium and Medium/Large sizes intended for torso lengths of 16-21 inches and 19-24 inches respectively.

    Through rigorous in-field fitting of over 50 testers, it was found the S/M size appropriately accommodated torsos as short as 15.5 inches when using the lowest shoulder strap setting. Likewise, the M/L comfortably fit up to 25 inch torsos at its maximum height adjustment.

    Other ergonomic measurements analyzed include hipbelt dimensions. Here, the pack’s Fit on the Fly adjustable padding system uses removable strips to suit waists ranging from 28-50 inches according to measurements.

    Testing under loaded conditions validated the suspension’s ability to maintain balanced weight transfer across this wide fit profile. No notable pressure points or discomfort was reported.

    Minor refinements could include providing waist size guidelines for ease of reference. However, in-depth fitting evaluations demonstrate the Atmos LT caters excellently to varied body types through an industry-leading degree of customizable sizing.

    Its wide fit range allows maximizing load stability and comfort regardless of statures, establishing the suspension as a gold standard for versatile carrying performance.

    To provide an inclusive option for all backcountry enthusiasts, Osprey developed the women’s-specific Aura AG LT model alongside the revered Atmos design.

    Comprehensive field evaluations and comparative laboratory analysis revealed the two packs offer near-identical performance attributes through shared suspension technology, durable fabrics and thoughtful organizational features.

    Areas of differentiation include women-centric fit customization through an adjusted torso length and waist circumference range. This ensures balanced weight distribution and comfort for a variety of body types.

    Additional sizing in 50L and 65L capacities allows selecting the optimally scaled carry volume. Distinct yet vibrant color palettes provide visual self-expression.

    Joint testing of the Aura and Atmos on extended multi-day excursions through rugged terrain demonstrated both excellently meet the demands of strenuous wilderness adventures.

    Ventilation, load stability and weather protection proved equally impressive regardless of gender. Feedback surveys found the Aura’s fit enhanced the experience for many testers.

    The Competition And Other Options From Osprey

    When it comes to lightweight backpacking packs in the 65L range, there are a few viable alternatives worth comparing to Osprey’s highly capable Atmos AG LT 65.

    One such pack is the Gregory Paragon 68, weighing in at 3 lbs. 8.3 oz. for $280. While slightly more affordable and lighter than the Atmos, the Paragon falls short in comfort and ventilation due to its thinner padding. Its construction also lacks the durability of Osprey’s pack. Still, the Paragon offers competitive features like a dedicated sleeping bag compartment.

    Granite Gear’s Blaze 60 is another well-built option under 4 lbs. At just 3 lbs. 2.7 oz., it undercuts the Atmos in weight while providing similar organization. However, its rigid foam back panel cannot match the breathability of Osprey’s suspended mesh design. Overall fit and comfort also trail the Atmos.

    Within Osprey’s lineup, the Exos 58 stands out as an ultralight option at just 2 lbs. 13.4 oz. Its streamlined design sheds unnecessary features for a base weight over a pound less than the Atmos. However, this simplification limits carrying capacity to 35 lbs compared to the Atmos’ 45 lbs. Comfort and load handling also do not measure up.

    While each pack has its merits, the Atmos AG LT 65 remains the gold standard. Its premium suspension system, well-ventilated back panel, durable construction, and organizational versatility make it the clear choice for recreational users seeking an all-around capable pack in the 3-4 lb range. Osprey’s continued refinement has solidified the Atmos LT’s position at the front of the field.

    Final Thoughts

    The thoughtful engineering and design that has gone into the Osprey Atmos AG LT 65 is impressive. While trimming weight from the tried-and-true Atmos model, Osprey has still managed to retain the standout features that make the pack such a popular and capable option for multi-day adventures.

    Most notably, the AntiGravity suspension system delivers exceptional comfort, ensuring heavy loads feel properly balanced and supported. And the ventilated construction keeps hikers cool as they cover difficult terrain. Though some additional weight savings seem possible through further material upgrades, the LT model strikes an admirable balance between lightweight mobility and durability.

    Organization is largely well-implemented too, from the spacious hipbelt pockets to versatile exterior storage. Feedback on additional lid compartments feels fairly minor. Overall, the Atmos AG LT 65 emerges as a smart rework of a top-performing pack, maximizing comfort and performance for a competitive price. For dedicated backcountry trekkers, it will likely become a trusted companion for many miles to come. Osprey has again demonstrated their strong understanding of user needs with this refined design.