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Durston Kakwa 55 vs ULA Equipment ULA Circuit Backpack

Editorial Team
Last modified at August 9, 2026
When it comes to ultralight backpacks, the Durston Kakwa 55 and the ULA Circuit are two of the most popular options. Both backpacks are designed for long-distance hiking and offer a range of features to enhance your hiking experience. However, they have distinct differences that may make one more suitable for your needs than the other.

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Durston Kakwa 55ULA Equipment ULA Circuit Backpack
Kakwa 55
ULA Circuit 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)

38.5 oz

Capacity

55 L

68 L total

Fabric Type

Ultra 200X or UltraGrid

ULA 400 Robic nylon with UltraStretch mesh

Hip Belt

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

Removable & Height Adjustable Pass-through Hipbelt

Seam Sealing

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

No — seams are not taped

Warranty

Lifetime

Lifetime

Fabric Denier

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

400D Robic

Hip Belt Size

S/M: 29–38 in; M/L: 33–42 in

XS: 26–30 in; S: 30–34 in; M: 34–38 in; L: 38–42 in; XL: 42–47 in; XXL: 47+ in

Side Compression Straps

Yes

Yes

Roll Top Closure

Yes

Yes

Durability

Kakwa 55

4.4/ 5.0

ULA Circuit Backpack

4.9/ 5.0

Durability is crucial for ultralight backpacks as they need to withstand the rigors of long-distance hiking. A more durable backpack ensures that your gear stays protected and the backpack itself lasts longer, providing better value for money. The ULA Circuit stands out with its highly water-resistant and tear-resistant materials, earning it a durability rating of 4.9/5. Buyers praise its robust construction, minimal signs of wear, and exceptional durability. The Durston Kakwa 55, while still durable with a rating of 4.4/5, has some complaints about stitching defects and minor cosmetic issues. For those prioritizing durability, the ULA Circuit is the clear winner.

Comfort

Kakwa 55

4.6/ 5.0

ULA Circuit Backpack

4.7/ 5.0

Comfort is essential for long-distance hiking, as an uncomfortable backpack can quickly ruin a trip. Both the Durston Kakwa 55 and the ULA Circuit excel in this category, with ratings of 4.6/5 and 4.7/5 respectively. The Kakwa 55 is praised for its comfortable shoulder straps, hip belt, and overall carrying capability. The ULA Circuit is noted for its fully padded back panel and excellent weight distribution. Both backpacks have minor complaints, but overall, they are tied in this category as both provide exceptional comfort for long-distance wear.

Fit

Kakwa 55

3.8/ 5.0

ULA Circuit Backpack

4.9/ 5.0

A good fit ensures that the backpack stays stable and comfortable during your hike. The ULA Circuit excels in this category with a rating of 4.9/5, thanks to its adjustable system and height-adjustable hip belt. Buyers appreciate the multiple adjustment points and customizable fit. The Durston Kakwa 55, with a rating of 3.8/5, has positive feedback for its stable ride and contoured shoulder straps but lacks the extensive adjustability of the ULA Circuit. For those needing a highly adjustable fit, the ULA Circuit is the better choice.

Accessibility

Kakwa 55

4.4/ 5.0

ULA Circuit Backpack

4.6/ 5.0

Accessibility refers to how easily you can access your gear while on the trail. The ULA Circuit scores slightly higher with a rating of 4.6/5, praised for its large pockets and side pouches. The Durston Kakwa 55, with a rating of 4.4/5, is noted for its easy-to-grab water bottles and generously sized pockets. Both backpacks offer excellent accessibility, but the ULA Circuit's slightly higher rating and positive feedback give it a slight edge.

Ventilation

Kakwa 55

1.9/ 5.0

ULA Circuit Backpack

2.8/ 5.0

Ventilation is important to keep your back cool and dry during strenuous hikes. Neither backpack excels in this category, but the ULA Circuit has a slightly better rating of 2.8/5 compared to the Kakwa 55's 1.9/5. The Kakwa 55 is criticized for its lack of a mesh back panel, leading to a sweaty back. The ULA Circuit also has complaints about ventilation but performs slightly better overall. If ventilation is a priority, neither backpack is ideal, but the ULA Circuit is the lesser of two evils.

Water Resistance

Kakwa 55

2.6/ 5.0

ULA Circuit Backpack

3.8/ 5.0

Water resistance is crucial for protecting your gear in wet conditions. The ULA Circuit has a higher rating of 3.8/5, praised for its highly water-resistant Ultra X material. The Durston Kakwa 55, with a rating of 2.6/5, has mixed reviews about its water resistance, with some buyers reporting leaks. For better protection against the elements, the ULA Circuit is the superior choice.

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Conclusion & Final Verdict:

In conclusion, both the Durston Kakwa 55 and the ULA Circuit are excellent ultralight backpacks, but they cater to slightly different needs. The Durston Kakwa 55 is the better choice for those prioritizing comfort and a lighter weight, making it ideal for thru-hikers who value a comfortable carry over long distances. On the other hand, the ULA Circuit excels in durability, fit, and accessibility, making it a great option for hikers who need a robust and adjustable backpack. If ventilation and water resistance are important to you, neither backpack is perfect, but the ULA Circuit performs slightly better in these areas.

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