ULA Equipment ULA Circuit Backpack vs Osprey Eja 58 Pack - Women's

Editorial Team
Last modified at July 22, 2026
Choosing the right backpacking backpack can significantly enhance your outdoor experience. The ULA Circuit Backpack and the Osprey Eja 58 Pack are both excellent choices, each with its unique strengths. This comparison will help you understand which backpack might be the best fit for your needs.

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ULA Equipment ULA Circuit BackpackOsprey Eja 58 Pack - Women's
ULA Circuit Backpack
Osprey Eja 58 Pack - Women's
Capacity

68 L total: 39.3 L main body; 6.6 L front; 6.6 L each side; 8.2 L collar; 1.5 L each hipbelt pocket

WXS/S: 55 L; WM/L: 58 L

Weight

2 lb 6.5 oz (38.5 oz)

WXS/S: 2 lb 11 oz; WM/L: 2 lb 13 oz

Torso Adjustability

SMALL: 15–18 in
MEDIUM: 18–21 in
LARGE: 21–24 in
X-LARGE: 24+ in

WXS/S: 13.5–17 in; WM/L: 16–19.5 in

Hip Belt Size Range

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

WXS/S: 26–50 in; WM/L: 28–50 in

Hydration Compatibility

Yes; hydration port, optional sleeve

Internal sleeve with center back hose port

Warranty

Lifetime (original owner, defects in materials and workmanship)

All Mighty Guarantee

Trekking Pole Attachment

Yes (Ice Axe/Trekking Pole Loops)

Yes

Rain Cover Compatibility

Compatible; sold separately

Compatible; not included

Side Pockets

Yes (each accommodates two 1-Liter bottles)

Yes; dual-access stretch side pockets

Hip Pockets

Yes (Dual Hipbelt Pockets)

Two hipbelt pockets

Sternum Strap

Yes (Removable & Height Adjustable)

Yes; adjustable with whistle

Load Lifters

Yes (adjustable)

Yes

Sleeping Bag Compartment

No separate compartment; roll-top main body

No separate compartment; top access

Comfort

ULA Circuit Backpack

4.2/ 5.0

Osprey Eja 58 Pack - Women's

4.3/ 5.0

Comfort is crucial for long hikes, as it directly impacts your endurance and enjoyment. A comfortable backpack should have well-padded straps, a supportive hip belt, and a design that minimizes back sweating. The ULA Circuit Backpack offers a fully padded back panel and shoulder straps, which are highly praised by users. However, it has some issues with back sweating, which can be a downside in warm weather. The Osprey Eja 58 Pack, on the other hand, features contoured shoulder straps and a comfortable hip belt with squishy foam, providing excellent cushioning and support. Both backpacks score similarly in comfort, making it a tie. If you prioritize padding and support, either backpack will serve you well.

Fit

ULA Circuit Backpack

4.7/ 5.0

Osprey Eja 58 Pack - Women's

4.2/ 5.0

A good fit ensures that the backpack sits comfortably on your body, distributing weight evenly and reducing strain. The ULA Circuit Backpack stands out with its adjustable shoulder straps and height-adjustable hip belt, offering multiple sizing options to fit various body shapes. This makes it a great choice for those who need a customized fit. The Osprey Eja 58 Pack is designed specifically for women, with adjustable torso sizing to ensure a snug fit. While both backpacks offer good fit options, the ULA Circuit Backpack's extensive adjustability gives it an edge. If you need a backpack that can be finely tuned to your body, the ULA Circuit is the better choice.

Load Transfer

ULA Circuit Backpack

4.7/ 5.0

Osprey Eja 58 Pack - Women's

4.3/ 5.0

Effective load transfer is essential for reducing strain on your shoulders and back, especially during long hikes. The ULA Circuit Backpack excels in this category with its four-point contact hip belt system and load lifters, which spread the weight effectively. Users consistently praise its ability to carry heavy loads comfortably. The Osprey Eja 58 Pack also performs well with its sturdy aluminum frame, which contours to your body and transfers weight to the hips. However, the ULA Circuit Backpack's system is slightly more effective, making it the winner in this category. If you plan to carry heavy loads, the ULA Circuit Backpack is the better option.

Ventilation

ULA Circuit Backpack

2.8/ 5.0

Osprey Eja 58 Pack - Women's

4.3/ 5.0

Ventilation is important to keep your back cool and dry, particularly in warm weather. The ULA Circuit Backpack has some issues with back sweating, which can be uncomfortable during strenuous hikes. In contrast, the Osprey Eja 58 Pack features a tensioned mesh back panel that provides unmatched ventilation, keeping your back cool and dry. This makes the Osprey Eja 58 Pack the clear winner in this category. If you hike in hot climates or tend to sweat a lot, the Osprey Eja 58 Pack is the better choice.

Organization

ULA Circuit Backpack

4.7/ 5.0

Osprey Eja 58 Pack - Women's

4.6/ 5.0

Organization features help you keep your gear accessible and well-arranged, making your hike more enjoyable. The ULA Circuit Backpack offers removable bottom and top straps, cinchable side pockets, and a roll-top closure, providing ample storage options. The Osprey Eja 58 Pack also has thoughtful features like a cavernous main body, large side pockets, and a removable top pocket. Both backpacks score similarly in organization, making it a tie. If you need a backpack with good organization features, either option will serve you well.

Accessibility

ULA Circuit Backpack

4.2/ 5.0

Osprey Eja 58 Pack - Women's

3.7/ 5.0

Accessibility is about how easily you can reach your gear without having to dig through your pack. The ULA Circuit Backpack offers side pouches, pockets, and hip belt pockets, making it easy to access essentials on the go. The Osprey Eja 58 Pack has side pockets with top and side access, but options are somewhat limited. The ULA Circuit Backpack's better accessibility features make it the winner in this category. If you need quick access to your gear, the ULA Circuit Backpack is the better choice.

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Conclusion & Final Verdict:

After comparing the ULA Circuit Backpack and the Osprey Eja 58 Pack, it's clear that both backpacks have their strengths. The ULA Circuit Backpack excels in fit, load transfer, and accessibility, making it a great choice for those who need a customized fit and easy access to their gear. The Osprey Eja 58 Pack offers better ventilation, making it ideal for hot weather hikes. If you prioritize comfort and weight distribution, go with the ULA Circuit Backpack. If ventilation is your top concern, the Osprey Eja 58 Pack is the better option.

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