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Gossamer Gear Kumo 36 Superlight vs REI Co-op Flash 45

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

Gossamer Gear Kumo 36 Superlight is the lighter option — 776 g lighter than the REI Co-op Flash 45 (65% less weight). If grams matter to you, that is the one to beat.
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Spec Gossamer Gear Kumo 36 Superlight REI Co-op Flash 45
Weight 414 g · 0.414 kg · 0.91 lb 1,190 g · 1.190 kg · 2.62 lb
Brand Gossamer Gear REI Co-op
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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REI Co-op Flash 45
1,190 g

Lightweight 45L versatile backpacking pack.

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Gossamer Gear Kumo 36 Superlight vs REI Co-op Flash 45: which should you buy?

If saving weight is your priority, the Gossamer Gear Kumo 36 Superlight wins — at 414 g it is 776 g (65%) lighter than the REI Co-op Flash 45 (1,190 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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