Gossamer Gear Kumo 36 Superlight vs Zpacks Arc Blast 55L

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

Gossamer Gear Kumo 36 Superlight is the lighter option — 36 g lighter than the Zpacks Arc Blast 55L (8% less weight). If grams matter to you, that is the one to beat.

Spec	Gossamer Gear Kumo 36 Superlight	Zpacks Arc Blast 55L
Weight	414 g · 0.414 kg · 0.91 lb	450 g · 0.450 kg · 0.99 lb
Brand	Gossamer Gear	Zpacks
Category	Backpack	Backpack

Gossamer Gear Kumo 36 Superlight

414 g

Frameless 36L ultralight pack in recycled Robic nylon, ideal for day hikes and minimalist overnight loads up to 25 lbs.

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Zpacks Arc Blast 55L

450 g

Frameless Dyneema pack with excellent load carry for its weight.

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Gossamer Gear Kumo 36 Superlight vs Zpacks Arc Blast 55L: which should you buy?

If saving weight is your priority, the Gossamer Gear Kumo 36 Superlight wins — at 414 g it is 36 g (8%) lighter than the Zpacks Arc Blast 55L (450 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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