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Durston Kakwa 55 vs Zpacks Arc Haul Ultralight Backpack

Editorial Team
Last modified at August 9, 2026
Choosing the right ultralight backpack can make a significant difference in your hiking experience. The Durston Kakwa 55 and Zpacks Arc Haul are both top contenders, but they cater to different needs. The Kakwa 55 is renowned for its exceptional comfort and durability, making it a favorite among thru-hikers. On the other hand, the Arc Haul shines with its superior ventilation and water resistance, ideal for those who prioritize staying dry and comfortable in various weather conditions.

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Durston Kakwa 55Zpacks Arc Haul Ultralight Backpack
Kakwa 55
Zpacks Arc Haul Ultralight Backpack
Weight

Ultra 200X: 30.1 oz (S), 31.5 oz (M), 32.4 oz (L); UltraGrid: 29.2 oz (S), 30.6 oz (M), 31.3 oz (L)

21.4 oz

Capacity

55 L

60 L

Fabric Type

Ultra 200X or UltraGrid

Ultra 100X

Hip Belt

Dual strap design with reverse pull 2:1 leverage for easy tightening; redesigned for 2026 with lumbar pad and improved durability

Yes — padded, removable, and interchangeable

Seam Sealing

No — not factory seam-taped; optional user seam sealing

Yes — taped seams

Warranty

Lifetime

2 Years

Fabric Denier

Ultra 200X: 200D; UltraGrid: 210D nylon with 200D UHMWPE grid

100D

Hip Belt Size

S/M: 29–38 in; M/L: 33–42 in

S: 25–30 in; M: 30–35 in; L: 35–40 in; XL: 40–55 in

Side Compression Straps

Yes

Yes — side compression cords

Roll Top Closure

Yes

Yes

Durability

Kakwa 55

4.4/ 5.0

Zpacks Arc Haul Ultralight Backpack

3.9/ 5.0

Durability is crucial for ultralight backpacks as it ensures the pack can withstand the rigors of long-distance hiking. A more durable backpack means fewer worries about wear and tear, allowing hikers to focus on their journey. The Durston Kakwa 55 excels in this category with a rating of 4.4/5, praised for its light and durable material, great fabric, and minimal wear and tear. Buyers appreciate its ultra 200x fabric, reinforced inner film, and perfect stitching. The Zpacks Arc Haul, with a rating of 3.9/5, also offers robust durability with its ultra 100 fabric and carbon fiber bars, but it has more complaints about durability issues and tiny pieces. Therefore, the Kakwa 55 is the better choice for those seeking a backpack that can endure heavy use.

Comfort

Kakwa 55

4.6/ 5.0

Zpacks Arc Haul Ultralight Backpack

3.9/ 5.0

Comfort is essential for long-distance hiking, as a comfortable backpack can significantly reduce fatigue and discomfort. The Durston Kakwa 55 leads with a comfort rating of 4.6/5, lauded for its supportive hip belt, contoured shoulder straps, and excellent weight distribution. Hikers appreciate how the pack disappears on their back and its lateral stability. The Zpacks Arc Haul, with a comfort rating of 3.9/5, offers a mesh back panel and comfortable shoulder straps but falls short in overall comfort compared to the Kakwa 55. Thus, the Kakwa 55 is the superior choice for those prioritizing comfort on their hikes.

Fit

Kakwa 55

3.8/ 5.0

Zpacks Arc Haul Ultralight Backpack

4.6/ 5.0

A good fit ensures that the backpack stays stable and comfortable, reducing the risk of discomfort and injury. The Zpacks Arc Haul excels in this category with a fit rating of 4.6/5, praised for its adjustable torso, shoulder straps, and patented adjustment system. Buyers appreciate its well-fitting pack and interchangeable belts. The Durston Kakwa 55, with a fit rating of 3.8/5, offers contoured shoulder straps and a stable ride but lacks the extensive adjustability of the Arc Haul. Therefore, the Arc Haul is the better choice for those seeking a highly adjustable and well-fitting backpack.

Accessibility

Kakwa 55

4.4/ 5.0

Zpacks Arc Haul Ultralight Backpack

4.2/ 5.0

Accessibility refers to how easily you can reach and access your gear while on the move. The Durston Kakwa 55 scores 4.4/5 in this category, praised for its generously sized pockets, stretchy mesh front pocket, and easy access to water bottles. Hikers appreciate the quick access pockets and one-handed operation. The Zpacks Arc Haul, with an accessibility rating of 4.2/5, offers side pockets and easy access to water bottles but falls slightly short compared to the Kakwa 55. Thus, the Kakwa 55 is the better choice for those prioritizing easy access to their gear.

Ventilation

Kakwa 55

1.9/ 5.0

Zpacks Arc Haul Ultralight Backpack

4.1/ 5.0

Ventilation is crucial for keeping your back cool and dry, especially during long hikes in warm conditions. The Zpacks Arc Haul excels in this category with a ventilation rating of 4.1/5, praised for its mesh back panel, trampoline back, and airflow. Hikers appreciate how it keeps their back drier and cooler. The Durston Kakwa 55, with a ventilation rating of 1.9/5, lacks a mesh back panel and has complaints about back sweat and heat. Therefore, the Arc Haul is the superior choice for those seeking better ventilation.

Water Resistance

Kakwa 55

2.6/ 5.0

Zpacks Arc Haul Ultralight Backpack

4.6/ 5.0

Water resistance is important for keeping your gear dry in wet conditions. The Zpacks Arc Haul leads with a water resistance rating of 4.6/5, praised for its waterproof fabric, taped seams, and waterproof backing. Hikers appreciate its ability to prevent water from seeping in. The Durston Kakwa 55, with a water resistance rating of 2.6/5, has complaints about not being fully waterproof and water seeping through seams. Thus, the Arc Haul is the better choice for those prioritizing water resistance.

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Conclusion & Final Verdict:

In conclusion, the Durston Kakwa 55 and Zpacks Arc Haul each have their strengths and weaknesses. The Kakwa 55 is the better choice for those prioritizing comfort, durability, and accessibility, making it ideal for thru-hikers who need a reliable and comfortable pack. On the other hand, the Arc Haul is superior in terms of ventilation, water resistance, and fit, making it a great option for hikers who need a pack that can handle various weather conditions and offers excellent adjustability.

Choose the Durston Kakwa 55 if: You prioritize comfort, durability, and easy access to your gear.

Choose the Zpacks Arc Haul if: You need better ventilation, water resistance, and a highly adjustable fit.

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