Gossamer Gear Kumo 36 Superlight Backpack Review

Overview

The Kumo 36 Superlight is Gossamer Gear’s do-it-all minimalist pack — a frameless 36-liter hauler built for hikers who’ve already dialed in a sub-15-lb base weight and don’t need a suspension system to carry it. It’s not trying to be a load hauler or a bombproof thru-hike workhorse; it’s aimed at ultralight overnighters, fast-and-light multi-day trips, and long day hikes where every ounce on your back matters more than bells and whistles.

Key Specs

Spec	Value
Weight	580 g (20.5 oz)
Total Volume	36 L
Main Compartment	28 L
Frame	Frameless
Max Recommended Load	25 lbs
Material	70D & 100D Recycled Robic Nylon, PFAS-free
Dimensions (Small)	10.5”W x 4.5”D x 18”H
Dimensions (Medium)	10.5”W x 4.5”D x 21”H
Closure	Roll-top
Hip Belt	Removable, two sizes included

Performance

The Kumo’s whole pitch is weight-to-feature ratio, and it mostly delivers. Weighing just 14.6 ounces (or 16.6 ounces including a SitLight foam pad), it’s a fully-featured ultralight backpack that can be used for overnight trips, but is on the small side in terms of capacity at 36 L, with 28 L of covered capacity and roughly 500 cubic inches in pockets. That’s a meaningful amount of organized storage for a pack this light — a stretchy front pocket, side bottle pockets, shoulder-strap pockets, and a rear mesh pocket all pull double duty as quick-access storage without having to break the roll-top seal.

Comfort is where the pack surprises people who assume “frameless” means “your shoulders will hate you.” The Kumo 36 Superlight Backpack is functional and super comfortable, even when fully loaded up, and while its space is limited, Gossamer Gear made exceptional use of the space. On technical terrain it stays put — during scrambling maneuvers the pack moved with the tester in a very nice way, never obstructing range of movement, and stayed solidly on the back with no uncomfortable rubbing or sliding. Long-term testers report similar results even further into a trip: the backpack carries great even fully loaded with a load of around 22 lbs, and the padded shoulder straps do a great job spreading the load and are still comfortable after an 8-hour day on trail (that’s the vest-style Fast Kumo variant, but the carry principles are shared).

The hip belt deserves a specific callout because it’s unusual for a pack this light: it’s genuinely removable and comes in two sizes bundled together. Both sizes are bundled with the pack, making it possible to share the Kumo between two people with different waistlines, and despite minimal padding, the lack of hip belt padding is not an issue — testers report being able to carry about 15 pounds all day with this hip belt without any real discomfort. Don’t expect it to transfer serious load off your shoulders past that 15-20 lb range, though — this is a frameless pack, and physics doesn’t care how nice the webbing is.

Where the Kumo gets more mixed reviews is durability and versatility. Outdoor Gear Lab’s testing flagged it directly: it’s a pack so light and small that it passes more for a daypack than a multi-day backpacking pack, and while it’s one of the lightest packs in its review class, the weight-to-volume ratio isn’t overwhelmingly light for the measured volume it has. Their bottom-line take was that the Kumo shines on long day hikes, and with a super-paired-down kit, it would work for weekend trips into the backcountry — but it’s not a pack you want to lean on for a heavy food carry or a long thru-hike resupply stretch.

Fabric durability is the recurring asterisk across reviews. Gossamer Gear updated the build to 70D/100D recycled Robic nylon, and testers note the 2024 redesign brought a lightweight and enduring 70D Recycled Robic Nylon build, which is tougher than the ultra-thin fabrics used on some competing frameless packs. Still, one long-distance tester’s experience is a useful cautionary tale: after a month on trail, the side pockets were in pretty bad shape enough that the pack was sent back to Gossamer Gear in exchange for a replacement, and the fix was simply making sure to only put one water bottle in each side pocket for the rest of the trail. If you’re rough on stretch-mesh pockets, treat them gently or expect to baby them.

A few small design quirks show up repeatedly: side panels can flare out awkwardly under the top lid, and the center ice axe loop placement is awkward, since two loops (one on each side) would work better than a single center loop. None of these are dealbreakers, but they’re the kind of thing you notice on trip three, not trip one.

Pros & Cons

Pros

• Genuinely one of the lightest fully-featured packs in the 30-40L class
• Removable hip belt in two sizes, bundled at no extra cost
• Excellent lateral stability and comfortable carry on technical/scrambling terrain
• Smart pocket layout (front stretch pocket, side bottle pockets, shoulder pockets) for on-the-move access
• Foam back panel doubles as a sit pad or sleeping pad supplement
• PFAS-free recycled fabric, a nice sustainability touch without a weight penalty

Cons

• 25 lb max load is a real ceiling, not a suggestion — heavier food/water carries will feel it
• Side pockets have shown wear issues under repeated water bottle abuse on long trips
• Frameless design means no meaningful load transfer past ~15-20 lbs
• Small enough capacity that it can feel more like an ambitious daypack than a multi-day hauler
• Minor design nitpicks (side panel flare, single-loop ice axe attachment)

Who Should Buy This

This pack is built for the hiker who already has a sub-15-lb base weight dialed in and wants a nearly-disappearing pack to carry it — think weekend ultralight overnighters, fast-and-light multi-day trips with minimal food carries, or ambitious day hikes where you want extra capacity in reserve. If your kit still includes a bulky sleeping bag, a framed tent, or you’re planning 5+ day food carries between resupplies, you’ll outgrow the Kumo’s comfort zone fast. It’s also a good fit for hikers who want a lightweight loaner setup, thanks to the two-size hip belt included in every purchase.

Verdict

The Kumo 36 Superlight does what it says on the label: it’s a fully-featured, sub-21-oz pack that carries surprisingly well for its minimal frame and padding, as long as you respect its 25-lb ceiling and treat the stretch pockets with some care. It’s not the pack for someone still transitioning off a traditional framed backpack, but for hikers who’ve already lightened their base weight, it’s one of the most compelling options in the class. I’d put it at a 7.8/10 — excellent value and comfort-to-weight ratio, docked slightly for the pocket durability concerns and the genuinely tight load ceiling.