Gossamer Gear Mariposa 60 Backpack vs ULA Equipment ULA Circuit Backpack

Editorial Team
Last modified at May 17, 2026
Choosing the right backpacking backpack can make or break your outdoor experience. The Gossamer Gear Mariposa 60 and ULA Circuit are both top contenders in the backpacking world, each offering unique features tailored to different needs. This comparison will help you understand which pack might be the best fit for your adventures, focusing on key categories like comfort, durability, stability, ventilation, adjustability, and organization.

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Gossamer Gear Mariposa 60 BackpackULA Equipment ULA Circuit Backpack
Mariposa 60 BackpackULA Circuit Backpack
Capacity

3660 cu in

4200 cu in

Weight

2.0875 lb

2.41 lb

Material

Recycled Robic nylon

ULA 400 Robic, UltraStretch™ Mesh

Frame Type

Aluminum, closed-shape frame (PVT Frame+Belt)

Internal Suspension Hoop

Volume

3660 cu in

4200 cu in

Warranty

N/A

Lifetime

Hip Belt Size

26–61.5 in

X-Small: 26–30 in
Small: 30–34 in
Medium: 34–38 in
Large: 38–42 in
X-Large: 42–47 in
XX-Large: 47+ in

Number Of Pockets

Ample

6

Load Lifters

Yes

Yes

Compression Straps

No

Side Compression Straps

Sternum Strap

Yes

Yes

Hydration Sleeve

No

Hydration Port

Rain Cover

N/A

Sold separately

Comfort

Mariposa 60 Backpack

4.7/ 5.0

ULA Circuit Backpack

4.4/ 5.0

Comfort is crucial for long treks, as it directly impacts your endurance and enjoyment on the trail. A comfortable backpack should distribute weight effectively, reducing strain on your back and shoulders. The Mariposa 60 excels with its highly praised hip belt and overall fit, making it feel almost effortless even with heavier loads. The ULA Circuit also offers a comfortable experience with its fully padded back panel and four-point contact hip belt system, but it falls slightly short compared to the Mariposa 60. The Mariposa's hip belt is noted for being wide, sturdy, and cushiony, which significantly enhances comfort during long hikes.

Durability

Mariposa 60 Backpack

4.6/ 5.0

ULA Circuit Backpack

4.3/ 5.0

Durability ensures your backpack can withstand the rigors of the trail, from rough terrain to frequent use. The Mariposa 60 stands out with its thickened nylon and reinforced materials, which have been praised for holding up well over hundreds of miles. The ULA Circuit, while also durable with its water-resistant and tear-resistant materials, has some reports of broken frames and gashes. The Mariposa's consistent positive feedback on durability makes it a more reliable choice for long-term use.

Stability

Mariposa 60 Backpack

4.7/ 5.0

ULA Circuit Backpack

4.7/ 5.0

Stability is essential for maintaining balance and control, especially on uneven terrain. Both the Mariposa 60 and ULA Circuit score equally high in this category. The Mariposa 60's load lifters and internal frame provide excellent weight distribution and reduce pack waggle. Similarly, the ULA Circuit's removable delrin hoop and metal frame stake offer robust stability, making it a tie between the two. Both packs are designed to carry loads up to 35 pounds effectively, ensuring a stable and balanced hike.

Ventilation

Mariposa 60 Backpack

3.2/ 5.0

ULA Circuit Backpack

3.6/ 5.0

Ventilation is important to keep you cool and comfortable, especially in hot climates. The ULA Circuit slightly edges out the Mariposa 60 in this category. While both packs have mesh features to enhance airflow, the ULA Circuit's mesh pockets and overall design seem to dry better and provide slightly better ventilation. The Mariposa 60, although breathable, has some feedback indicating it can feel warmer on hotter days.

Adjustability

Mariposa 60 Backpack

3.9/ 5.0

ULA Circuit Backpack

4.4/ 5.0

Adjustability allows for a personalized fit, accommodating different body types and preferences. The ULA Circuit takes the lead here with its highly adjustable system, including removable and height-adjustable hip belts and shoulder straps. The Mariposa 60 also offers adjustability with its load lifters and sternum strap, but it doesn't match the ULA Circuit's level of customization. This makes the ULA Circuit a better choice for those who need a more tailored fit.

Organization

Mariposa 60 Backpack

4.6/ 5.0

ULA Circuit Backpack

4.6/ 5.0

Organization helps keep your gear accessible and well-arranged, saving you time and effort on the trail. Both the Mariposa 60 and ULA Circuit score equally high in organization. The Mariposa 60 offers ample pockets and pouches, including an oversized mesh pouch and bottle holders, making it easy to store and access gear. The ULA Circuit also provides excellent organization with large hip belt pockets and a dorsal pocket, ensuring your essentials are always within reach.

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Conclusion & Final Verdict:

Both the Gossamer Gear Mariposa 60 and ULA Circuit are excellent backpacking backpacks, each with its own strengths. The Mariposa 60 excels in comfort and durability, making it a great choice for those who prioritize a comfortable and long-lasting pack. The ULA Circuit, on the other hand, offers better adjustability and ventilation, along with a larger capacity and more comprehensive warranty.

Final Verdict: If comfort and durability are your top priorities, go with the Mariposa 60. If you need a more adjustable and slightly better-ventilated pack with a larger capacity, the ULA Circuit is the way to go.

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