Atom Packs Pulse EP50 vs Six Moon Designs Swift X

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

Atom Packs Pulse EP50 is the lighter option — 85 g lighter than the Six Moon Designs Swift X (11% less weight). If grams matter to you, that is the one to beat.

Spec	Atom Packs Pulse EP50	Six Moon Designs Swift X
Weight	680 g · 0.680 kg · 1.50 lb	765 g · 0.765 kg · 1.69 lb
Brand	Atom Packs	Six Moon Designs
Category	Backpack	Backpack

Atom Packs Pulse EP50

680 g

UK-made 50L ultralight thru-hiking pack with a carbon hooped frame and EcoPak fabric, carrying loads up to ~14kg comfortably.

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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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Atom Packs Pulse EP50 vs Six Moon Designs Swift X: which should you buy?

If saving weight is your priority, the Atom Packs Pulse EP50 wins — at 680 g it is 85 g (11%) 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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