Gossamer Gear Mariposa 60 vs Six Moon Designs Fusion 55

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

Gossamer Gear Mariposa 60 is the lighter option — 5 g lighter than the Six Moon Designs Fusion 55 (1% less weight). If grams matter to you, that is the one to beat.

Spec	Gossamer Gear Mariposa 60	Six Moon Designs Fusion 55
Weight	617 g · 0.617 kg · 1.36 lb	622 g · 0.622 kg · 1.37 lb
Brand	Gossamer Gear	Six Moon Designs
Category	Backpack	Backpack

Gossamer Gear Mariposa 60

617 g

Ultralight 60L frameless pack with sit pad back panel.

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Six Moon Designs Fusion 55

622 g

Ultralight 55L frameless Dyneema pack.

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Gossamer Gear Mariposa 60 vs Six Moon Designs Fusion 55: which should you buy?

If saving weight is your priority, the Gossamer Gear Mariposa 60 wins — at 617 g it is 5 g (1%) lighter than the Six Moon Designs Fusion 55 (622 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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