Maker’s warranty: Manufacturing defects are repaired, replaced or refunded (no term stated); covers original purchaser from an authorized dealer; not purchases from third-party sites (Amazon, eBay, Craigslist); paid repairs. Hyperlite Mountain Gear’s terms, read Oct 25, 2026
A 40-liter pack from Hyperlite Mountain Gear for technical alpine climbing, ice climbing and mountaineering, made with Dyneema Woven Composite 5.0. It has a drawstring closure with extension collar and lid, a tool pocket for ice tools and a crampon pouch. Hyperlite lists a weight of 981 g.
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 28–52 L in the RidgeNote register with a published figure. Manufacturer-listed; sources and dates are on this page.
The lightest of the 28–52 L backpacks on record is Gossamer Gear Murmur 36 Hyperlight Backpack (Aluula) at 7.9 oz — 756 g less and $100 less.
The cheapest is Naturehike Rock 2.0 Backpack 45L at $99.99 — $350 less and 219 g heavier.
Main models on the same shelf, compared with the Prism 40 on the makers’ published figures; the tick on each bar is the Prism 40.
Hyperlite Mountain Gear
Waypoint 35
11.1 oz lighter (315 g)
$70 less
Hyperlite Mountain Gear
Aspect 32
7.3 oz lighter (207 g)
$80 less
Gossamer Gear
Murmur 36 Hyperlight Backpack (Aluula)
1.67 lb lighter (756 g)
$100 less
Not ranked: 20 with no published volume, 1 with no published weight.
See all 31 →
Gossamer Gear
Aero Jet
$225 less
1.2 oz heavier (35 g)
Big Agnes
Causeway 28L
$250 less
2.6 oz lighter (74 g)
Gossamer Gear
Gorilla 50
$175 less
3.4 oz lighter (96 g)
Not ranked: 21 with no published list price, 16 with no published volume.
See all 31 →
Naturehike
45L Rock
5 L more
2.8 oz heavier (80 g)
Gossamer Gear
Gorilla 50
10 L more
3.4 oz lighter (96 g) · $175 less
Big Agnes
Sweetwater UL 43L
3 L more
5.3 oz heavier (149 g) · $170 less
Not ranked: 21 with no published volume.
See all 10 →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.