Gossamer Gear Murmur 36 Hyperlight Backpack vs Gregory Optic 48

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

Gossamer Gear Murmur 36 Hyperlight Backpack is the lighter option — 1,145 g lighter than the Gregory Optic 48 (84% less weight). If grams matter to you, that is the one to beat.

Spec	Gossamer Gear Murmur 36 Hyperlight Backpack	Gregory Optic 48
Weight	225 g · 0.225 kg · 0.50 lb	1,370 g · 1.370 kg · 3.02 lb
Brand	Gossamer Gear	Gregory
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.

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Gregory Optic 48

1,370 g

Lightweight 48L trail pack with suspended mesh back panel.

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Gossamer Gear Murmur 36 Hyperlight Backpack vs Gregory Optic 48: which should you buy?

If saving weight is your priority, the Gossamer Gear Murmur 36 Hyperlight Backpack wins — at 225 g it is 1,145 g (84%) lighter than the Gregory Optic 48 (1,370 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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