Atom Packs Pulse EP50 vs Durston Kakwa 55 (2025)

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

Atom Packs Pulse EP50 is the lighter option — 170 g lighter than the Durston Kakwa 55 (2025) (20% less weight). If grams matter to you, that is the one to beat.

Spec	Atom Packs Pulse EP50	Durston Kakwa 55 (2025)
Weight	680 g · 0.680 kg · 1.50 lb	850 g · 0.850 kg · 1.87 lb
Brand	Atom Packs	Durston
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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Durston Kakwa 55 (2025)

850 g

55L ultralight thru-hiking pack in Ultra 200X fabric with tubular aluminum frame, carries up to 20kg comfortably.

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Atom Packs Pulse EP50 vs Durston Kakwa 55 (2025): which should you buy?

If saving weight is your priority, the Atom Packs Pulse EP50 wins — at 680 g it is 170 g (20%) lighter than the Durston Kakwa 55 (2025) (850 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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