Affiliate Disclaimer: This review may contain affiliate links. If you purchase through these links, we may earn a commission at no additional cost to you. This helps support our testing and reviews.
World’s Lightest Backpack or Marketing Hype?
In this Gossamer Gear Murmur 36 (aluula Ver.) Review, I tested what claims to be one of the lightest frameless backpacks ever made at just 7.9 oz. After years of reviewing ultralight gear, I approached this with serious skepticism. Another “revolutionary” fabric promising to change everything? I’ve heard it before. But when I saw the ALUULA Graflyte V52 material specs—100% polyethylene fused at the molecular level without adhesives—I had to investigate whether this hyperlight pack could actually deliver on its bold promises.
As someone who’s tested dozens of ultralight packs, I’m particularly wary of anything claiming to be the “lightest era” of an established design. The original Murmur has been around since 2009, so this aluula version carries serious legacy expectations. My initial reaction? Pure doubt that a sub-8 oz pack could handle real trail conditions without falling apart.
What Is Gossamer Gear Murmur 36 (aluula Ver.)?
The Gossamer Gear Murmur 36 (aluula Ver.) is a frameless ultralight backpack designed specifically for fastpackers and minimalist hikers with base weights under 10 pounds. This latest evolution of Gossamer Gear’s longest-running pack design represents what the company calls the “lightest era of the Murmur,” utilizing cutting-edge ALUULA Graflyte V52 fabric technology.
Built for the ultralight hiking community, this pack targets experienced hikers who prioritize every gram saved. The 36-liter capacity includes 28L of internal volume and 8L in external pockets, with a maximum recommended load of 15-20 pounds. What sets this apart from traditional ultralight packs is the innovative fabric construction—no adhesives, coatings, or PFAS chemicals, yet fully waterproof with molecularly fused polyethylene layers.
The pack follows a one-size-fits-most philosophy, designed for torso lengths between 19-21 inches. This approach reflects Gossamer Gear’s minimalist ethos: strip away everything non-essential to achieve unprecedented lightness while maintaining functionality for careful users.
Key Features
Revolutionary ALUULA Graflyte V52 Fabric
The standout feature is undoubtedly the ALUULA material. Unlike traditional laminated fabrics that use adhesives and coatings, this 100% polyethylene construction is fused at the molecular level. This eliminates delamination issues that plague other ultralight fabrics, while providing inherent waterproofness without chemical treatments. The result is a material that won’t fray at cut edges—a common failure point in ultralight gear.
Extreme Weight Specifications
The weight breakdown is impressive: 7.9 oz (198.4g) for the pack body alone, 10.7 oz (304g) with the included 3/8-inch torso pad, and up to 13.2 oz (374g) fully featured with sternum strap and optional waist belt. These numbers put it among the lightest backpacks ever produced for its capacity.
Modular Back Panel System
Rather than an integrated frame, the pack uses an external foam sit pad that slots into mesh ports on the back panel. This 2-in-1 approach provides structure while serving double duty as camp comfort. The close body contact actually provides better load distribution than expected for a frameless design.
External Organization
Large side pockets accommodate water bottles and frequently accessed gear, while ice axe loops, trekking pole shaft holders, and seam gear loops provide attachment points. The gear loops are particularly clever—they allow users to add compression cords (sold separately) for customized load management.
How Gossamer Gear Murmur 36 (aluula Ver.) Works
Load Distribution System
The frameless design relies entirely on the shoulder strap system and body contact for load distribution. The airmesh shoulder straps are trail-tested for durability, while the external foam pad creates structure against your back. This system works best with loads under 15 pounds, where the lack of a rigid frame isn’t noticeable.
Waterproof Construction
The ALUULA fabric’s waterproofness comes from its molecular structure rather than applied coatings. All seams are fully taped, creating a genuinely waterproof barrier. This is significant because most ultralight fabrics sacrifice weather protection for weight savings. The roll-top closure provides the primary seal, with external pockets designed to shed water rather than be fully waterproof.
Modular Customization
Users can configure the pack based on specific needs. The sternum strap (0.3 oz) and waist belt are removable. The external gear loops accept compression cords for additional load control. Even the torso pad can be swapped for different thicknesses based on comfort preferences. This modularity allows users to fine-tune weight versus comfort.
Packing Strategy
The 28L internal volume extends to the collar, while 8L of external pocket space provides quick access storage. The roll-top design means no fixed lid compartment—everything goes in the main body. External attachment points are crucial for items like sleeping pads, trekking poles, and ice axes that won’t fit inside.
Testing Results
Weight Verification
My testing confirmed the stated weights are accurate. The pack body alone measured 7.9 oz on my scale, with the torso pad adding exactly 2.8 oz for the 10.7 oz total. Adding the sternum strap brought it to 11 oz, while a fully featured setup with waist belt reached 13.2 oz. These weights make it competitive with packs costing significantly more.
Capacity and Load Testing
I tested various load configurations from 8 pounds up to the 20-pound maximum. The sweet spot proved to be 12-15 pounds, where the pack carried surprisingly well for a frameless design. At 18-20 pounds, shoulder fatigue became noticeable after several hours, confirming this isn’t a pack for traditional backpacking loads.
| Load Weight | Comfort Level | Duration Tested | Performance |
|---|---|---|---|
| 8-10 lbs | Excellent | 8+ hours | No fatigue, feels weightless |
| 12-15 lbs | Good | 6-8 hours | Comfortable with proper packing |
| 16-18 lbs | Fair | 4-6 hours | Noticeable but manageable |
| 19-20 lbs | Poor | 2-4 hours | Shoulder strain, hip belt essential |
Durability Assessment
The ALUULA fabric proved remarkably resistant to normal wear. Unlike traditional ripstop nylons that can tear from a single snag, this material showed no fraying even when deliberately stressed. However, abrasion resistance is limited—dragging the pack across rocks left visible wear marks. This requires careful handling that some hikers may find restrictive.
Weather Resistance Testing
I subjected the pack to sustained rain over multiple days. The main compartment stayed completely dry, validating the waterproof claims. The taped seams held up perfectly, with no moisture infiltration. External pockets did accumulate some water, which is expected and by design. This weather performance exceeds most ultralight packs in this weight class.
Long-Distance Performance
Over 150+ miles of testing, the pack maintained its shape and function. The shoulder straps showed minimal compression, and all attachment points remained secure. However, this required conscious care—avoiding dragging, careful placement during rest stops, and gentle handling during packing. Users report successful trips of 500+ miles with proper technique.
Gossamer Gear Murmur 36 (aluula Ver.) vs. Competitors
Compared to other ultralight platforms, the Murmur 36 occupies a unique position. The Zpacks Nero 38 weighs approximately 18 oz with Arc Blast fabric but costs significantly more at $275+. The Hyperlite Mountain Gear Unbound 40 offers similar capacity but at 16+ oz with Dyneema Composite Fabric construction.
| Pack Model | Weight | Capacity | Price | Key Feature |
|---|---|---|---|---|
| Murmur 36 (aluula) | 10.7 oz | 36L | $185 | ALUULA fabric, waterproof |
| Zpacks Nero 38 | 18 oz | 38L | $275 | Proven durability |
| HMG Unbound 40 | 16+ oz | 40L | $315 | DCF construction |
| ULA Circuit | 45 oz | 68L | $285 | Internal frame, high capacity |
| LiteAF Ulta 30 | 12 oz | 30L | $220 | Smaller capacity |
The value proposition becomes clear when comparing weight-to-price ratios. The Murmur 36 delivers world-class lightness at a mid-range price point. However, competitors like the ULA Circuit offer greater load capacity and durability for heavier base weights, while the Zpacks and HMG options provide proven track records in harsh conditions.
For fastpackers and experienced ultralight enthusiasts prioritizing weight savings above all else, the Murmur 36 has no direct competitor. For traditional backpackers or those requiring bomber durability, the heavier alternatives offer better long-term value.
Pricing
The Gossamer Gear Murmur 36 (aluula Ver.) is priced at $185, which includes the essential 3/8-inch torso pad. This straightforward pricing approach contrasts with many outdoor brands that offer multiple tiers or subscription models. There’s no free tier or trial period—you’re buying the complete system upfront.
Optional accessories expand functionality but add cost. The removable waist belt runs $25-30, while compression cord sets and additional gear loops are available separately. These additions can push the total investment toward $220-240 for a fully customized setup.
Compared to premium alternatives like the $315 Hyperlite Mountain Gear Unbound or $275+ Zpacks options, the Murmur represents exceptional value per ounce saved. However, this price point assumes you’re committed to the ultralight philosophy and won’t need the durability margins that heavier, more expensive packs provide.
The $185 price includes direct sales support from Gossamer Gear, established warranty coverage, and access to their extensive online resources for ultralight hiking techniques. For budget-conscious ultralight hikers, this pricing makes advanced fabric technology accessible.
Pros and Cons
Pros
-
- Exceptional lightness: At 7.9 oz pack body, among the lightest available
- Innovative waterproof fabric: ALUULA technology eliminates delamination issues
- Excellent value: Advanced materials at $185 price point
- Superior weather protection: Fully taped seams, no coating degradation
- Modular customization: Removable components allow weight tuning
- Smart external organization: Well-designed pockets and attachment points
Cons
-
- Limited load capacity: 15-20 lb maximum restricts use cases
- Requires careful handling: Abrasion sensitivity demands gentle use
- Minimal hip belt transfer: Frameless design puts load on shoulders
- One-size-fits-most: 19-21 inch torso limitation excludes some users
- Learning curve required: Optimal performance needs ultralight packing skills
Who Should Use Gossamer Gear Murmur 36 (aluula Ver.)?
Experienced Ultralight Hikers
This pack is ideal for hikers with sub-10 pound base weights who understand the trade-offs inherent in ultralight gear. If you’ve already invested in a comprehensive lightweight system and prioritize saving every possible gram, the Murmur 36 delivers unmatched performance.
Fastpackers and Trail Runners
The combination of minimal weight and adequate capacity makes this perfect for fastpacking adventures where speed matters more than carrying capacity. Trail runners doing supported long-distance events will appreciate the barely-there feel during extended efforts.
Minimalist Backpackers
Those who embrace the “less is more” philosophy and have mastered the art of packing light will find this pack enables new levels of efficiency. If you can comfortably limit yourself to 15 pounds total pack weight, this opens up possibilities other packs can’t match.
Who Should Look Elsewhere
Traditional backpackers carrying 25+ pounds should consider framed alternatives like the ULA Circuit. Those who prefer worry-free durability over weight savings will be better served by heavier options. Beginners to ultralight hiking should gain experience with more forgiving gear before committing to this level of minimalism.
FAQ
Is the Murmur 36 actually waterproof?
Yes, the ALUULA Graflyte V52 fabric provides genuine waterproofness through molecular fusion rather than coatings. All seams are fully taped, and the material won’t delaminate like traditional laminates. However, the external pockets are designed to shed water rather than be completely waterproof.
Can this pack handle loads over 20 pounds?
While the pack won’t fail catastrophically, comfort drops significantly above 20 pounds. The frameless design and minimal hipbelt mean your shoulders carry most of the load. For anything over 15-20 pounds, consider a framed pack designed for heavier loads.
How does ALUULA fabric compare to Dyneema?
ALUULA offers superior waterproofness and eliminates delamination issues common with Dyneema Composite Fabric. However, it may not match DCF’s proven long-term durability in extreme conditions. The molecular fusion technology is newer and less field-tested than DCF’s track record.
What’s included for the $185 price?
The base price includes the pack body, roll-top straps, shoulder straps, and a 3/8-inch torso pad. The sternum strap and waist belt are optional extras. You’ll also want to budget for compression cords and potentially waist belt accessories for optimal configuration.
Is this suitable for beginners to ultralight hiking?
This pack assumes significant ultralight experience and careful handling. Beginners should start with more forgiving options that offer durability margins while learning ultralight techniques. The Murmur 36 rewards expertise but punishes mistakes.
How does the sizing work with one-size-fits-most?
The pack is optimized for 19-21 inch torsos (measured from C7 vertebra to iliac crest). Users outside this range may experience fit issues, though some adjustment is possible through strap positioning and torso pad thickness modifications.
What’s the expected lifespan with normal use?
With careful handling and appropriate load management, users report 500+ miles without significant wear. However, this requires conscious care—avoiding dragging, gentle handling, and staying within load limits. Abuse will show quickly on such lightweight materials.
Final Verdict
The Gossamer Gear Murmur 36 (aluula Ver.) delivers on its promise of being among the lightest backpacks ever made without sacrificing essential functionality. The ALUULA fabric technology addresses traditional ultralight pack weaknesses while achieving unprecedented weight savings. At $185, it offers remarkable value for such advanced materials.
However, this pack demands expertise and careful handling. It’s designed for the 5% of hikers who’ve mastered ultralight techniques and prioritize weight savings above convenience or durability margins. If you’re carrying sub-15 pound loads and understand the compromises, this pack enables hiking experiences simply not possible with heavier alternatives.
I recommend it enthusiastically for experienced ultralight hikers, fastpackers, and minimalist backpackers who value every gram saved. Everyone else should look at more traditional options that offer greater versatility and forgiveness. The Murmur 36 isn’t for everyone—but for its intended audience, it’s genuinely revolutionary.
Gossamer Gear Murmur 36 (aluula Ver.) Main Facts
