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Osprey Aura AG 50L Women's Backpacking Backpack vs ULA Equipment ULA Circuit Backpack

Editorial Team
Last modified at August 9, 2026
When it comes to backpacking, having the right backpack can make all the difference. The Osprey Aura AG 50L Women's Backpacking Backpack and the ULA Equipment ULA Circuit Backpack are two top contenders designed specifically for women. Both offer unique features that cater to different needs and preferences.

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Osprey Aura AG 50L Women's Backpacking BackpackULA Equipment ULA Circuit Backpack
Osprey Aura AG 50L Women's Backpacking Backpack
ULA Circuit Backpack
Capacity

WXS/S: 47 L; WM/L: 50 L

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

Weight

WXS/S: 4 lb 4 oz; WM/L: 4 lb 5 oz

2 lb 6.5 oz (38.5 oz)

Torso Adjustability

WXS/S: 13–17 in; WM/L: 16–20 in

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

Hip Belt Size Range

26-29.5 in
26-35 in
29.5-35 in
35-41 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

Hydration Compatibility

Internal hydration reservoir sleeve with center back exit port

Yes; hydration port, optional sleeve

Warranty

All Mighty Guarantee

Lifetime (original owner, defects in materials and workmanship)

Trekking Pole Attachment

Stow-on-the-Go trekking pole attachment system

Yes (Ice Axe/Trekking Pole Loops)

Rain Cover Compatibility

Included raincover made with PFC/PFAS-free DWR and bluesign® approved materials

Compatible; sold separately

Side Pockets

Tall dual-access side water bottle pockets

Yes (each accommodates two 1-Liter bottles)

Hip Pockets

Dual zippered hipbelt pockets

Yes (Dual Hipbelt Pockets)

Sternum Strap

Adjustable sternum strap with whistle

Yes (Removable & Height Adjustable)

Load Lifters

Yes

Yes (adjustable)

Sleeping Bag Compartment

Zippered sleeping bag compartment with removable divider

No separate compartment; roll-top main body

Comfort

Osprey Aura AG 50L Women's Backpacking Backpack

4.6/ 5.0

ULA Circuit Backpack

4.2/ 5.0

Comfort is crucial for long backpacking trips, as it directly impacts your enjoyment and endurance on the trail. A comfortable backpack will reduce strain on your back and shoulders, allowing you to focus on the journey rather than the weight on your back. The Osprey Aura AG 50L excels in comfort with its Anti-Gravity suspension system, which provides excellent load transfer and makes the pack feel lighter. Buyers praise its size, anti-gravity features, and the comfortable mesh, which hugs the body without causing pressure points or pain. The ULA Circuit, while also comfortable, has a fully padded back panel and shoulder straps that carry weight effectively but may cause more back sweating. The Aura's superior comfort makes it the better choice for those prioritizing a comfortable carry.

Fit

Osprey Aura AG 50L Women's Backpacking Backpack

3.6/ 5.0

ULA Circuit Backpack

4.7/ 5.0

A good fit ensures that the backpack sits correctly on your body, distributing weight evenly and reducing the risk of discomfort or injury. The ULA Circuit stands out with its adjustable shoulder straps and height-adjustable hip belt, making it highly customizable to different body shapes and sizes. Buyers appreciate the multiple sizing options and the ability to adjust the hip belt and load lifters for a perfect fit. The Osprey Aura AG 50L, while fitted and engineered well for women, has some complaints about the hip belt size and form, which may not hold the bag in place as effectively. The Circuit's superior fit makes it the better choice for those needing a highly adjustable backpack.

Load Transfer

Osprey Aura AG 50L Women's Backpacking Backpack

3.4/ 5.0

ULA Circuit Backpack

4.7/ 5.0

Effective load transfer is essential for reducing strain on your back and shoulders, especially during long hikes. The ULA Circuit excels in this category with its four-point contact hip belt system and load lifters, which spread the weight out very well and disperse it effectively. Buyers consistently praise its ability to carry loads comfortably. The Osprey Aura AG 50L, while also good at load transfer with its Anti-Gravity suspension system, has some complaints about the hip belt not holding the bag in place and causing stress on the lower back. The Circuit's superior load transfer makes it the better choice for those carrying heavier loads.

Ventilation

Osprey Aura AG 50L Women's Backpacking Backpack

3.1/ 5.0

ULA Circuit Backpack

2.8/ 5.0

Proper ventilation helps to keep you cool and dry, reducing the risk of discomfort and chafing during long hikes. The Osprey Aura AG 50L has a slight edge in ventilation with its mesh and airflow design, which provides a breeze and reduces sweat. However, some buyers still report issues with chafing and rubbing. The ULA Circuit has complaints about back sweating, which can be a significant downside for some users. While neither backpack is perfect in this category, the Aura's slightly better ventilation makes it the winner.

Organization

Osprey Aura AG 50L Women's Backpacking Backpack

3.9/ 5.0

ULA Circuit Backpack

4.7/ 5.0

Good organization features help you keep your gear easily accessible and well-arranged, saving you time and effort on the trail. The ULA Circuit excels in organization with its removable bottom and top straps, cinchable side pockets, and multiple compartments. Buyers praise its compression system and roll-top style design, which make packing and accessing gear straightforward. The Osprey Aura AG 50L also offers good organization with its pockets and detachable lid, but some buyers report issues with pockets creasing into themselves. The Circuit's superior organization makes it the better choice for those who value easy access to their gear.

Accessibility

Osprey Aura AG 50L Women's Backpacking Backpack

3.7/ 5.0

ULA Circuit Backpack

4.2/ 5.0

Easy access to your gear can save you time and hassle, especially when you need something quickly. The ULA Circuit has a slight edge in accessibility with its side pouches and pockets, which buyers find easy to reach. The Osprey Aura AG 50L also offers good accessibility with its water bladder and quick-access pockets, but some buyers report issues with the front pouch and clips. While both backpacks perform well in this category, the Circuit's slightly better accessibility makes it the winner.

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Conclusion & Final Verdict:

In conclusion, both the Osprey Aura AG 50L and the ULA Circuit are excellent backpacking backpacks designed for women, but they cater to different needs. The Osprey Aura AG 50L is the better choice for those prioritizing comfort and ventilation, while the ULA Circuit excels in fit, load transfer, and organization. If you need a backpack that feels lighter and more comfortable on long hikes, go with the Osprey Aura AG 50L. However, if you value adjustability, better weight distribution, and easy access to your gear, the ULA Circuit is the way to go.

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