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Six Moon Designs Swift X vs Zpacks Arc Scout 37L

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

Zpacks Arc Scout 37L is the lighter option — 375 g lighter than the Six Moon Designs Swift X (49% less weight). If grams matter to you, that is the one to beat.
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Spec Six Moon Designs Swift X Zpacks Arc Scout 37L
Weight 765 g · 0.765 kg · 1.69 lb 390 g · 0.390 kg · 0.86 lb
Brand Six Moon Designs Zpacks
Category Backpack Backpack
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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Zpacks Arc Scout 37L
390 g

Compact Dyneema frameless pack for lightweight overnighters.

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Six Moon Designs Swift X vs Zpacks Arc Scout 37L: which should you buy?

If saving weight is your priority, the Zpacks Arc Scout 37L wins — at 390 g it is 375 g (49%) 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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