Black Diamond Beta Light 45L vs Gossamer Gear Murmur 36 Hyperlight Backpack
Weight and specs compared for 2026 — and which one to choose.
Lightweight 45-liter backpack designed for alpine and minimalist backpacking. Can be stripped to 650g by removing hip belt and internal stays.
Full details →Frameless 36L hyperlight thru-hiking pack made from ALUULA Graflyte fabric, with roll-top closure and included torso pad.
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Black Diamond Beta Light 45L vs Gossamer Gear Murmur 36 Hyperlight Backpack: which should you buy?
If saving weight is your priority, the Gossamer Gear Murmur 36 Hyperlight Backpack wins — at 225 g it is 665 g (75%) lighter than the Black Diamond Beta Light 45L (890 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.