Outdoor Vitals Carbon Evo 50

The Shadowlight Carbon 60 pairs carbon stays with conventional woven fabrics rather than Ultra laminate, which is why it undercuts the CS40 Ultra by $30 while offering 11 L more in total.

The CS40 Ultra pairs Challenge UltraWeave 200 with carbon fibre stays for 27 oz (size M) at 53 L. Outdoor Vitals sells direct, which is why the price sits below comparable cottage packs using the same fabric.

Outdoor Vitals puts a vest harness on its Skyline 30 fastpack: 23 L main plus pockets for 26 L total in S/M, or 31 L total in the large. It weighs 20.6 oz in S/M without the two soft flasks that ship with it, and Outdoor Vitals rates it to 20 lb for base weights of 10 lb or less.

With the Scream 55 gone, the Zerk 55 UL is the only current 55 L pack in Mountainsmith's range, the larger-volume version of its 2026 roll-top Zerk update. It holds 53 L, or 58 L with the roll top extended, on a removable EVA/Atilon frame sheet rated for a suggested 40 lb. At 3 lb 8 oz it is heavier than most packs sold as ultralight, so it suits hikers who want a burly fabric and a sheet frame more than a minimal gram count.

The Kakwa 55 is Dan Durston's disruptively priced ultralight — under 2 lbs, a 45 lb load rating, and a 2026 update with a redesigned hipbelt, with a $199 UltraGrid version and the $279 Ultra 200X build listed here. It has become the value benchmark every new UL pack gets measured against.

The Nero Pro is the upgraded Nero: 12.5 oz for the 40 L against the Classic's 10.9 oz, for $20 to $40 more depending on size. The extra weight buys a more robust build in the same frameless, waterproof format across the same 30 to 50 L range.