Gossamer Gear Murmur 36 Hyperlight Backpack vs Hyperlite Mountain Gear Unbound 40
Weight and specs compared for 2026 — and which one to choose.
Frameless 36L hyperlight thru-hiking pack made from ALUULA Graflyte fabric, with roll-top closure and included torso pad.
Check price Full details →40L Dyneema Composite Hybrid pack with internal frame and waterproof roll-top closure. Built for alpine and storm-prone conditions.
Check price Full details →Gossamer Gear Murmur 36 Hyperlight Backpack vs Hyperlite Mountain Gear Unbound 40: which should you buy?
If saving weight is your priority, the Gossamer Gear Murmur 36 Hyperlight Backpack wins — at 225 g it is 605 g (73%) lighter than the Hyperlite Mountain Gear Unbound 40 (830 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.