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Gossamer Gear Murmur 36 Hyperlight Backpack vs REI Co-op Flash 45

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

Gossamer Gear Murmur 36 Hyperlight Backpack is the lighter option — 965 g lighter than the REI Co-op Flash 45 (81% less weight). If grams matter to you, that is the one to beat.
Spec Gossamer Gear Murmur 36 Hyperlight Backpack REI Co-op Flash 45
Weight 225 g · 0.225 kg · 0.50 lb 1,190 g · 1.190 kg · 2.62 lb
Brand Gossamer Gear REI Co-op
Category Backpack Backpack
Gossamer Gear Murmur 36 Hyperlight Backpack
225 g

Frameless 36L hyperlight thru-hiking pack made from ALUULA Graflyte fabric, with roll-top closure and included torso pad.

Check price Full details →
REI Co-op Flash 45
1,190 g

Lightweight 45L versatile backpacking pack.

Full details →

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Gossamer Gear Murmur 36 Hyperlight Backpack vs REI Co-op Flash 45: which should you buy?

If saving weight is your priority, the Gossamer Gear Murmur 36 Hyperlight Backpack wins — at 225 g it is 965 g (81%) 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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