Patagonia Ascensionist 35L vs Six Moon Designs Swift X

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

Patagonia Ascensionist 35L is the lighter option — 27 g lighter than the Six Moon Designs Swift X (4% less weight). If grams matter to you, that is the one to beat.

Spec	Patagonia Ascensionist 35L	Six Moon Designs Swift X
Weight	738 g · 0.738 kg · 1.63 lb	765 g · 0.765 kg · 1.69 lb
Brand	Patagonia	Six Moon Designs
Category	Backpack	Backpack

Patagonia Ascensionist 35L

738 g

Lightweight climbing and hiking 35L pack.

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Six Moon Designs Swift X

765 g

Highly configurable 50L ultralight pack with removable stay, hip belt and vest harness options to dial in fit and weight.

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Patagonia Ascensionist 35L vs Six Moon Designs Swift X: which should you buy?

If saving weight is your priority, the Patagonia Ascensionist 35L wins — at 738 g it is 27 g (4%) lighter than the Six Moon Designs Swift X (765 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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