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Osprey Levity 45 vs Six Moon Designs Fusion 55

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

Six Moon Designs Fusion 55 is the lighter option — 178 g lighter than the Osprey Levity 45 (22% less weight). If grams matter to you, that is the one to beat.
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Spec Osprey Levity 45 Six Moon Designs Fusion 55
Weight 800 g · 0.800 kg · 1.76 lb 622 g · 0.622 kg · 1.37 lb
Brand Osprey Six Moon Designs
Category Backpack Backpack
Osprey Levity 45
800 g

Ultralight 45L pack at 800g. Designed for minimalist backpackers with Nanofly ripstop and Lightwire frame.

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Six Moon Designs Fusion 55
622 g

Ultralight 55L frameless Dyneema pack.

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Osprey Levity 45 vs Six Moon Designs Fusion 55: which should you buy?

If saving weight is your priority, the Six Moon Designs Fusion 55 wins — at 622 g it is 178 g (22%) lighter than the Osprey Levity 45 (800 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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