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Osprey Atmos AG 65 vs ULA Circuit

Weight and specs compared for 2026 — and which one to choose.

ULA Circuit is the lighter option — 1,088 g lighter than the Osprey Atmos AG 65 (50% less weight). If grams matter to you, that is the one to beat.
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Spec Osprey Atmos AG 65 ULA Circuit
Weight 2,180 g · 2.180 kg · 4.81 lb 1,092 g · 1.092 kg · 2.41 lb
as listed 'at a glance'; size not stated on the page
Brand Osprey ULA
Category Backpack Backpack
Osprey Atmos AG 65
2,180 g

Full-featured 65L pack with Anti-Gravity suspension. Ideal for extended trips.

See it in your base weight → Full details →
ULA Circuit
1,092 g

Ultralight 68L frameless pack. Thru-hiker favourite.

See it in your base weight → Full details →

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Osprey Atmos AG 65 vs ULA Circuit: which should you buy?

If saving weight is your priority, the ULA Circuit wins — at 1,092 g it is 1,088 g (50%) lighter than the Osprey Atmos AG 65 (2,180 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest backpack page, or browse the full gear weight database.

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