Maker’s warranty: Manufacturing defects, within one year, within the United States; covers the purchaser; discounted third-party repair (Rugged Thread). Gossamer Gear’s terms, read Oct 25, 2026
A 36-liter fastpack from Gossamer Gear, a redesign of its Kumo with a vest-style harness and storage that can be reached while moving. Gossamer Gear builds it for trail runners and fastpackers.
Figures with a source link to the page they were read from, with the date we checked it.How we get these figures →Wrong figure? Tell us
Packs are sized by torso length, not height. How to measure yours →
Weight and price against the backpacks of 26–46 L in the RidgeNote register with a published figure. Manufacturer-listed; sources and dates are on this page.
The lightest of the 26–46 L backpacks on record is Gossamer Gear Murmur 36 Hyperlight Backpack (Aluula) at 7.9 oz — 361 g less for $160 more.
The cheapest is Naturehike Rock 2.0 Backpack 45L at $99.99 — $90 less and 614 g heavier.
Main models on the same shelf, compared with the Fast Kumo 36 Fastpack on the makers’ published figures; the tick on each bar is the Fast Kumo 36 Fastpack.
Gossamer Gear
Grit 28 Fastpack
4.5 oz lighter (127 g)
$10 less
Hyperlite Mountain Gear
Summit 30
4.9 oz lighter (138 g)
$20 more
Gossamer Gear
Skala 38 Backpack
0.3 oz lighter (8 g)
$35 more
Not ranked: 20 with no published volume, 1 with no published weight.
See all 11 →
Gossamer Gear
Vagabond Jet
$60 less
3.8 oz heavier (108 g)
Gossamer Gear
Grit 28 Fastpack
$10 less
4.5 oz lighter (127 g)
Naturehike
Rock 2.0 Backpack 45L
$90 less
1.35 lb heavier (614 g)
Not ranked: 18 with no published list price, 16 with no published volume.
Open in search →Gossamer Gear
Skala 38 Backpack
2 L more
0.3 oz lighter (8 g) · $35 more
Zpacks
Arc Haul Ultra 40L Backpack
4 L more
0.4 oz heavier (11 g)
Zpacks
Women's Arc Haul Ultra 40L Backpack
4 L more
0.4 oz lighter (11 g)
Not ranked: 21 with no published volume.
See all 11 →Ultralight backpacks ranked by maker-published weight: 40 models. Lightest: Gossamer Gear Murmur 36 Hyperlight Backpack (Aluula) at 7.9 oz (225 g).
Six backpacking packs from 45 to 68 L: how to fit one, then their published volume, frame, load range, weight and list price, with a reason to skip each.