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The lightest 40L framed pack on the market. 18.7 ounces.
$450 | 40L capacity | Max load: 25 lbs | Best for: weekend trips, fastpacking, ultralight thru-hiking
What Makes It Different
At 18.7 ounces for the Mirage pack body (19.4 oz fully loaded), the Mirage 40 is the lightest 40-liter framed backpack available. Period. That’s lighter than most frameless packs, but with the structure to actually carry a load comfortably.
The carbon fiber X-frame uses solid 0.125-inch rods that connect directly to the hipbelt, transferring weight to your hips instead of your shoulders. On mile twenty, that matters. The adjustable torso system (16-20 inches) and customizable back air space mean the pack fits your body, not the other way around. Hipbelt adjusts from 28 to 44 inches.
Built with waterproof ALUULA Graflyte V52, a fused mono-polymer fabric with no adhesives, no coatings, and no risk of delamination. Full interior seam taping keeps everything dry. The material is also PFAS-free and recycle-ready, so you’re not carrying toxic chemicals into the wilderness.
Storage That Works
Main compartment: 40L roll-top closure with dual-side buckles for quick access and compression
Water bottle pockets: Integrated side pockets with cinch tops keep bottles secure and accessible without stopping
Front pocket: Stretch mesh overflow pocket for layers, snacks, or gear you need on the move
Compression: Side lace-cord system cinches loads tight and keeps gear stable on rough terrain
Attachment points: Multiple lash points for trekking poles, ice axes, or accessories
The roll-top design adapts to whatever you’re carrying, compress it down for minimalist trips or expand for longer hauls. Everything has a place. Nothing rattles.
Technical Specs
Weight:
- Pack body (stripped): 18.7 oz / 530 g
- Total weight: 19.4 oz / 550 g
Dimensions:
- Height: 23.6″ to extension collar / 29.9″ to top
- Width: 11.8″ / Depth: 6.3″
- Capacity: 40L including pockets
Fit Range:
- Torso: 16-20 inches
- Hipbelt: 28-44 inches
- Max carry capacity: 25 lbs
Materials:
- ALUULA Graflyte V52 (100% polyethylene)
- Carbon fiber frame (0.125″ solid rods)
- EVA foam shoulder harness and hipbelt
- PFAS-free with recycle-ready construction
How to Size Your Torso
The Gossamer Gear Mirage 40 comes in one size that fits torsos from 16 to 20 inches. Here’s how to measure:
- Find your C7 vertebra (the bump at the base of your neck when you bend forward)
- Locate your iliac crest by cupping your hipbones, find where your thumbs meet at your spine
- Measure the distance between these two points with help from someone else
This measurement is your torso length. If you’re between 16-20 inches, the Mirage 40 will fit.
Built to Last (And Leave No Trace)
ALUULA Graflyte V52 is a fused mono-polymer fabric: no glues, no coatings, no layers that separate over time. The construction method means the fabric can be recycled at end of life, and it’s completely PFAS-free. You’re not leaving forever chemicals on the trail.
The carbon fiber frame is built to handle years of use without adding unnecessary weight. EVA foam in the shoulder straps and hipbelt provides comfort without bulk. This pack is designed to outlast seasons, not just survive them.
Waterproof with full interior seam taping means your gear stays dry in rain, river crossings, or when you inevitably drop it in a puddle. No rain cover needed.
What It’s Best For
- Weekend trips and fastpacking: Carries 2-4 days of gear comfortably at ultralight weights
- Thru-hiking resupply sections: Perfect for the sub-25 lb loads between town stops
- Alpine missions: Light and stable enough for technical terrain
- Shoulder season trips: When you need a bit more volume but refuse to carry unnecessary weight
The Bottom Line
The GG Mirage 40 is for people who know that every ounce matters but refuse to sacrifice comfort or durability to get there. If you’re carrying a 25-pound pack and need it to feel like 15, this is the answer. If you want a pack that doesn’t fall apart after a season, this is it.
Lightest 40L framed pack available. Waterproof. Built to last. No compromises.