# What are the lightest 50l backpacks available? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What are the lightest 50l backpacks available?

## Products

### Durston Kakwa 55 UltraGrid
```yaml
product: durston-kakwa-55-ultragrid
brand: Durston
price_gbp: 148.48
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 30.6 oz (M)
capacity: 55 L
material: UltraGrid
hydration_system: Hydration port (reservoir not included)
number_of_pockets: 8
adjustable_torso_length: Small: 15-18 in; Medium: 17-20 in; Large: 19-22 in
```

- **Price:** £148.48 [^1]
- **Summary:** The Kakwa 55 UltraGrid is an ultralight multi-day pack with a tubular aluminum frame, sewn-on hipbelt, multiple external pockets, and lightweight UltraGrid fabric for durability. It delivers near 55 L internal capacity with an exceptionally low pack weight, designed for thru-hiking and fastpacking where pack weight and load transfer matter.
- **Ideal For:** It suits the query because at ~30.6 oz (medium) and 55 L capacity it is one of the lightest 50l-class backpacks available while retaining a framed suspension and durable UltraGrid material.
- **Additional Sources:** [^2], [^3]

### Mystery Ranch Zerk 40 (50L equivalent)
```yaml
product: mystery-ranch-zerk-40-50l-equivalent
brand: Mystery Ranch
price_gbp: 164.11
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 40
```

- **Price:** £164.11 [^4]
- **Summary:** The Zerk 40 is a 40 L fast-pack with roll-top closure, multiple external mesh pockets, and running vest-style shoulder straps designed for high-mileage, fastpacking use. It's built from durable nylon ripstop and includes a hydration sleeve and removable foam framesheet for structure and comfort.
- **Ideal For:** Ideal for the lightest 50l backpack search because it delivers a 40 L main volume in a lightweight frameless fast-pack design with numerous external pockets and a removable framesheet.

### Zpacks Arc Haul Ultra 60 (50L)
```yaml
product: zpacks-arc-haul-ultra-60-50l
brand: Zpacks
price_gbp: 297.7
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 21.6 oz / 613 g
capacity: 50L
material: Ultra 100X (UHMWPE)
hydration_system: false
number_of_pockets: 3
adjustable_torso_length: true
```

- **Price:** £297.7 [^5]
- **Summary:** The Arc Haul Ultra 50L is an ultralight framed backpack made from Ultra 100X fabric with a curved carbon fiber Arc Frame, roll-top main compartment, front mesh pocket, and side water bottle pockets. It weighs about 21.6 oz and features a ventilated suspended back, taped seams for water resistance, and modular add-ons for customization. It suits thru-hikers and fastpackers who prioritize low weight and ventilation for multi-day trips.
- **Ideal For:** Ideal for the lightest 50l backpack question because it combines a 50L capacity with a very low weight of 21.6 oz and an ultradurable Ultra 100X material.
- **Additional Sources:** [^6], [^7]

### Atom Packs Pulse EP50
```yaml
product: atom-packs-pulse-ep50
brand: Atom Packs
price_gbp: 205.18
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 675 g
capacity: 50 L
material: EPX200 main fabric; EPX400 base; 210D Robic Extreema pockets and straps; Dyneema mesh front and bottom pockets
hydration_system: No (external pocket compatible with bottles)
number_of_pockets: 8
adjustable_torso_length: Yes (multiple torso sizes: e.g., Small 15-17 in)
```

- **Price:** £205.18 [^8]
- **Summary:** The Pulse EP50 is an ultralight, customizable 50 L backpack built from lightweight EPX200 fabric with a durable EPX400 base, removable carbon hooped frame and padded hipbelt. It features multiple external pockets including Dyneema mesh, stretchy shoulder pockets, and configurable torso and hipbelt sizing, suited for thru-hikers and ultralight backpackers.
- **Ideal For:** Ideal for the question because at 675 g weight and 50 L capacity it is among the lightest 50 L backpacks, giving a weight-to-capacity ratio of ~0.0135 kg per liter.
- **Additional Sources:** [^9], [^8], [^9]

### Gossamer Gear Gorilla 50
```yaml
product: gossamer-gear-gorilla-50
brand: Gossamer Gear
price_gbp: 153.88
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 31.9 oz / 905 g
capacity: 50 L
material: 70D and 100D Recycled Robic Nylon
hydration_system: Hydration compatible
number_of_pockets: 7
adjustable_torso_length: Small 16 in - 18 in; Medium 18 in - 20 in; Large 20 in - 22 in
```

- **Price:** £153.88 [^10]
- **Summary:** The Gorilla 50 is an ultralight framed 50 L backpack with a PVT aluminum frame, removable sit pad, and multiple hipbelt options aimed at thru-hikers and minimalist multi-day trips. It combines lightweight recycled Robic nylon construction with ample external pockets and a supportive pivoting hipbelt for comfort on trails.
- **Ideal For:** Ideal for the question because at ~32.0 oz (905 g) total weight and 50 L capacity it is one of the lightest framed 50 L packs available while retaining supportive PVT frame and hipbelt features.
- **Additional Sources:** [^11], [^12], [^10], [^11], [^12]

### Gossamer Gear Gorilla 50 Ultralight Backpack
```yaml
product: gossamer-gear-gorilla-50-ultralight-backpack
brand: Gossamer Gear
price_gbp: 153.88
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 31.2 oz / 885 g
capacity: 50 L
material: 70D and 100D recycled Robic Nylon
hydration_system: true
number_of_pockets: 5
adjustable_torso_length: Yes (S:16-18 in, M:18-20 in, L:20-22 in)
```

- **Price:** £153.88 [^13]
- **Summary:** A feature-rich ultralight framed pack with a PVT aluminum frame and pivoting hipbelt, large external pockets, and a 10 L extension collar for flexible capacity. It balances low weight with comfort and load-carrying ability for multi-day thru-hikes.
- **Ideal For:** Suitable for the question because at 31.2 oz (885 g) and 50 L capacity it is one of the lightest framed 50 L backpacks while retaining a supportive aluminum frame and padded hipbelt.
- **Additional Sources:** [^10], [^14]

### Hyperlite Mountain Gear Unbound 55 / Southwest 55 (lab-measured ~50L main compartment options)
```yaml
product: hyperlite-mountain-gear-unbound-55-southwest-55-lab-measured-50l-main-compartment-options
brand: Hyperlite Mountain Gear
price_gbp: 294.71
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 30.2 oz
capacity: 55L
material: Dyneema Woven Composite
hydration_system: Hydration compatible, port over right shoulder
number_of_pockets: 6
adjustable_torso_length: false
```

- **Price:** £294.71 [^15]
- **Summary:** Ultralight, waterproof backpacks built from Dyneema Woven Composite with roll-top closure, external pockets, and internal frame stays; both suit multi-day and thru-hiking where low weight and durability matter. The Unbound includes a removable padded hipbelt and multiple external pockets; the Southwest emphasizes abrasion-resistant solid pockets and a sewn-on hipbelt.
- **Ideal For:** Ideal for lightest 50l backpacks buyers because at ~30 oz weight, 55L capacity, Dyneema construction, and roll-top compression it offers one of the best weight-to-volume ratios available.
- **Additional Sources:** [^16], [^17]

### Mountain Laurel Designs Exodus 55L
```yaml
product: mountain-laurel-designs-exodus-55l
brand: Mountain Laurel Designs
price_gbp: 182.8
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 18 oz
capacity: 55L
material: Ultra X 100 or UltraGrid 200d RipStop
number_of_pockets: 3 mesh pockets
adjustable_torso_length: M L XL options (torso sizes)
```

- **Price:** £182.8 [^18]
- **Summary:** A frameless ultralight pack built from highly durable, water-resistant Challenge Ultra fabrics with a minimalist roll-top design and large external rear pocket. It weighs about 18 oz and is intended for experienced ultralight hikers who pack carefully and carry modest loads.
- **Ideal For:** Suitable for the lightest 50l backpacks search because at ~55 L and 18 oz it offers one of the lowest weights for this capacity class.
- **Additional Sources:** [^19], [^20], [^21], [^22]

### Outdoor Vitals Shadowlight Carbon 60 (lab-measured 49L main + 15L external)
```yaml
product: outdoor-vitals-shadowlight-carbon-60-lab-measured-49l-main-15l-external
brand: Outdoor Vitals
price_gbp: 223.81
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: Regular 25oz
capacity: Main 49L; External 15L
material: 100D Robic Nylon with 200D Spectra Ripstop
hydration_system: Removable hydration sleeve
number_of_pockets: 8
adjustable_torso_length: Short, Regular, Tall
```

- **Price:** £223.81 [^23]
- **Summary:** A lightweight 60L total-capacity pack with a 49L main compartment and 15L external pockets, carbon-fiber stay suspension (CARBONFLEX), extensive external storage, and a removable hip belt. It's built from Robic nylon/Spectra ripstop with stretch mesh pockets and is rated to carry up to 40 lbs. Suited to thru-hikers and ultralight backpackers seeking lots of external organization at under 2 lb base weight.
- **Ideal For:** Ideal for the question because at 25oz (size Regular) and 49L main capacity it is one of the lightest full-featured ~50L packs while still offering a 40 lb carry rating.

### Pa'lante Gear V2 (approx 50L)
```yaml
product: pa-lante-gear-v2-approx-50l
brand: Pa'lante Gear
price_gbp: 179.07
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 476 to 499 g
capacity: 31 to 37 L
material: 210D UHMWPE Gridstop or 200D UltraWeave
hydration_system: Flask compatible / bottle-accessible side pockets
number_of_pockets: 4 (bottom pocket, rear pocket, two strap pockets)
adjustable_torso_length: 16 in or 19 in
```

- **Price:** £179.07 [^24]
- **Summary:** A minimalist, frameless lightweight backpack available in two torso lengths and two fabric options (Gridstop or UltraWeave). It features a roll-top closure, external stretch mesh pockets including a bottom pocket and stashable hipbelt, aimed at fast-and-light and thru-hiking users. Weighs about 476-499 g with internal capacity 31-37 L.
- **Ideal For:** Suited for the question because at ~476-499 g (approximately 1.05-1.10 lb) and ~31-37 L it is among the lightest packs near 50L-class frameless designs due to its UHMWPE fabrics and minimal construction.
- **Additional Sources:** [^25], [^26]

### Six Moon Designs Swift V 50L
```yaml
product: six-moon-designs-swift-v-50l
brand: Six Moon Designs
price_gbp: 205.18
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 35.96 oz
capacity: 50L
material: Robic Nylon
hydration_system: Dual Hydration Ports, removable hydration bladder sleeve
number_of_pockets: 6
adjustable_torso_length: 16 in - 22 in
```

- **Price:** £205.18 [^27]
- **Summary:** The Swift V is a 50L ultralight, top-loading backpack with a removable Delrin hoop stay, roll-top extension collar, multiple harness and hip-belt configurations, and stretch mesh exterior pockets for on-the-go access. It's built from Robic nylon to keep cost and weight down while retaining features like large shoulder-strap pockets and a breathable contact panel, suiting long-distance and fastpacking use.
- **Ideal For:** Ideal for the lightest 50L packs because it weighs 35.96 oz and uses a removable Delrin hoop stay and minimalistic Robic Nylon construction to keep weight low while retaining 50L capacity.
- **Additional Sources:** [^28]

### Superior Wilderness Designs Wolverine 50
```yaml
product: superior-wilderness-designs-wolverine-50
brand: Superior Wilderness Designs
price_gbp: 297.7
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 31oz to 36oz
capacity: 50L
material: Ultra400X
hydration_system: false
number_of_pockets: 3
adjustable_torso_length: Up to 4in
```

- **Price:** £297.7 [^29]
- **Summary:** The Wolverine 50 is a tall-frame, load-hauling internal-frame pack built from Ultra400X fabric with two removable 7075 aluminum stays, a supportive floating hip belt, and external pockets for bottles and gear. It's water-resistant, highly abrasion resistant, and designed to carry heavy loads comfortably for multi-day and off-trail trips.
- **Ideal For:** It suits the question because at 31oz to 36oz weight and a 50L capacity it is among the lightest framed packs that can comfortably carry 40-60 lb loads.
- **Additional Sources:** [^30]

### SWD Wolverine 50
```yaml
product: swd-wolverine-50
brand: SWD
price_gbp: 297.7
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 2 lbs 4 oz
capacity: 50L
material: Ultra 400x
hydration_system: false
number_of_pockets: 3
adjustable_torso_length: Up to 4 in
```

- **Price:** £297.7 [^30]
- **Summary:** The SWD Wolverine 50 is an ultralight, high-capacity pack built for heavy loads, featuring a durable Ultra 400x fabric, floating hip belt, and water-resistant construction. It suits hikers who need a rugged, lightweight pack that carries large loads with minimal weight penalty.
- **Ideal For:** Because it weighs 2 lbs 4 oz and offers a lab-measured main compartment volume of 45L with a tested carry capacity up to 60 lbs, it's a top choice for those seeking one of the lightest 50l-class backpacks that still handle heavy loads.
- **Additional Sources:** [^31]

### ULA Equipment CDT 54L
```yaml
product: ula-equipment-cdt-54l
brand: ULA Equipment
price_gbp: 246.21
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 20.2 oz without hipbelt
capacity: 54 L
material: Challenge ULTRA™ X (Ultra 400X and Ultra 200X)
hydration_system: Hydration reservoir compatible with two side ports
number_of_pockets: Front stretch mesh pocket, 2 side pockets, 2 hipbelt pockets, internal removable pockets (exact count not specified)
adjustable_torso_length: Multiple sizes available (15-18 in, 18-21 in, 21-24 in, 24 in+)
```

- **Price:** £246.21 [^32]
- **Summary:** The ULA CDT 54L is a frameless ultralight backpack built from Ultra laminated fabrics for high strength and water resistance, offering about 54 liters of total volume with a roll-top closure, large stretch front pocket, adjustable side pockets, and removable foam back panel. It's designed for ultralight thru-hikers and travelers who want a high-capacity, low-weight pack with customizable options. The pack can be purchased without a hipbelt to save additional weight.
- **Ideal For:** Ideal for the question because at 54 L capacity and a base weight of 20.2 oz (without hipbelt) it ranks among the lightest full-size 50l-class backpacks while still providing external pockets and Ultra fabric durability.
- **Additional Sources:** [^33]

### Zpacks Arc Haul Ultra 50
```yaml
product: zpacks-arc-haul-ultra-50
brand: Zpacks
price_gbp: 297.7
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
weight: 21.8 oz
capacity: 50 L
material: Ultra 100X UHMWPE
hydration_system: false
number_of_pockets: 3
adjustable_torso_length: true
```

- **Price:** £297.7 [^6]
- **Summary:** The Arc Haul Ultra 50 is an ultralight framed backpack with a curved carbon-fiber arc frame and suspended mesh back panel that maximizes ventilation and load transfer while keeping weight under 22 oz. It uses Ultra 100X fabric, offers modular accessory pockets, and is built for long-distance and ultralight hikers who prioritize low pack weight and ventilation.
- **Ideal For:** Ideal for the question because at 21.8 oz and 50 L it is among the lightest full-frame 50L packs available, offering a carbon arc frame and Ultra 100X fabric for minimal weight.
- **Additional Sources:** [^34], [^35], [^6], [^34], [^35]

---
## References & Sources
[^1]: Durston Gear, accessed 2026-06-14. https://durstongear.com/products/kakwa-55
[^2]: CleverHiker (product page), accessed 2026-06-14. https://www.cleverhiker.com/backpacking/durston-kakwa-55-ultralight-backpack-review/
[^3]: SectionHiker (product review/shop link), accessed 2026-06-14. https://sectionhiker.com/durston-gear-kakwa-55-backpack-review/
[^4]: REI, accessed 2026-06-14. https://www.rei.com/product/C05627/mountainsmith-zerk-40-pack
[^5]: Zpacks, accessed 2026-06-14. https://zpacks.com/products/arc-haul-ultra-50l-backpack
[^6]: Zpacks (Women's), accessed 2026-06-14. https://zpacks.com/products/womens-arc-haul-ultra-50l-backpack
[^7]: Zpacks (Arc Haul Ultra collection), accessed 2026-06-14. https://zpacks.com/collections/arc-haul-ultra-backpacks
[^8]: Atom Packs (official), accessed 2026-06-14. https://atompacks.co.uk/products/the-pulse-ep50-black
[^9]: CleverHiker (affiliate review with retailer link), accessed 2026-06-14. https://www.cleverhiker.com/backpacking/atom-packs-the-pulse-ep50-ultralight-backpack-review/
[^10]: Gossamer Gear, accessed 2026-06-14. https://www.gossamergear.com/products/gorilla-50-ultralight-backpack-large-yellow
[^11]: CleverHiker (listing), accessed 2026-06-14. https://www.cleverhiker.com/backpacking/gossamer-gear-gorilla-50-backpack-review/
[^12]: Garage Grown Gear, accessed 2026-06-14. https://garagegrowndesigns.com/collections/packs/products/gossamer-gear-gorilla-50
[^13]: Gossamer Gear, accessed 2026-06-14. https://www.gossamergear.com/products/gorilla-50
[^14]: OutdoorGearLab, accessed 2026-06-14. https://www.outdoorgearlab.com/reviews/camping-and-hiking/ultralight-backpack/gossamer-gear-gorilla-50
[^15]: Hyperlite Mountain Gear, accessed 2026-06-14. https://hyperlitemountaingear.com/products/southwest
[^16]: Garage Grown Gear, accessed 2026-06-14. https://www.garagegrowngear.com/products/unbound-55l-by-hyperlite-mountain-gear
[^17]: SectionHiker (review/specs page), accessed 2026-06-14. https://sectionhiker.com/hyperlite-mountain-gear-southwest-55-backpack-review-2/
[^18]: Mountain Laurel Designs (manufacturer), accessed 2026-06-14. https://mountainlaureldesigns.com/product/exodus-57l/
[^19]: Mountain Laurel Designs (shop listing), accessed 2026-06-14. https://mountainlaureldesigns.com/shop/packs/
[^20]: Mountain Laurel Designs (store), accessed 2026-06-14. https://mountainlaureldesigns.com/product/exodus-55l/
[^21]: Mountain Laurel Designs (product listing via tag), accessed 2026-06-14. https://mountainlaureldesigns.com/product-tag/thru-hike-pack/
[^22]: AdventureAlan, accessed 2026-06-14. https://www.adventurealan.com/product/mountain-laurel-designs-exodus-55l-pack/
[^23]: Garage Grown Gear, accessed 2026-06-14. https://www.garagegrowngear.com/products/shadowlight-carbon-60-backpack-by-outdoor-vitals
[^24]: Pa'lante Packs (official), accessed 2026-06-14. https://palantepacks.com/products/v2
[^25]: Outdoorline EU, accessed 2026-06-14. https://www.outdoorline.eu/products/palante-packs-v2
[^26]: Treeline Review (retailer link/Garage Grown Gear listing referenced), accessed 2026-06-14. https://www.treelinereview.com/gearreviews/palante-v2-backpack-vest-straps-review
[^27]: Six Moon Designs, accessed 2026-06-14. https://www.sixmoondesigns.com/products/swift-v-hiking-backpack
[^28]: SectionHiker (shop link to Six Moon Designs), accessed 2026-06-14. https://sectionhiker.com/six-moon-designs-swift-v-backpack-review/
[^29]: Superior Wilderness Designs, accessed 2026-06-14. https://www.swdbackpacks.com/product-page/wolverine-95l-internal-frame
[^30]: Backpacker (review listing, retailer price), accessed 2026-06-14. https://www.backpacker.com/gear/backpacks/best-ultralight-backpacks/
[^31]: SWD (Superior Wilderness Designs), accessed 2026-06-14. https://swdgear.com/products/wolverine-50
[^32]: ULA Equipment (official), accessed 2026-06-14. https://www.ula-equipment.com/product/ultra-cdt/
[^33]: Backcountry, accessed 2026-06-14. https://www.backcountry.com/ula-equipment-cdt
[^34]: Treeline Review (links to Zpacks), accessed 2026-06-14. https://www.treelinereview.com/gearreviews/zpacks-arc-haul-ultra-50l-backpack-review
[^35]: OutdoorGearLab (listing), accessed 2026-06-14. https://www.outdoorgearlab.com/reviews/camping-and-hiking/ultralight-backpack/zpacks-arc-haul-ultra