Alpinisto Series

Gregory Fusion Flex Technology


  • Fusion Flex is a lightweight, robust suspension system designed for harsh alpine environments. Its single aluminum stay and die-cut HDPE framesheet provide crucial load support while the climbing-specific hipbelt and harness maintain comfort for technical ascents.
    Fusion Flex combines crucial load management, and simple, durable design to offer climbers the ideal alpine-minimalist pack suspension system. A die-cut HDPE framesheet and single formed 7075-T6 aluminum center stay provide support for heavy loads, and a cross stay prevents barreling after hasty packing efforts in harsh weather. Meanwhile, the snow-shedding back panel resists moisture absorption, and removable padding in the high-cut, harness-compatible hipbelt allows for maximum weight reduction without the loss of support. Tapered, dual-density shoulder padding and an anti-slip lumbar pad maintain mobility and proper load transfer over waterproof layers.


A - Die-Cut HDPE Framesheet
With a 7075-T6 aluminum stay creates ideal support structure and optimal load transfer.

B - Tapered Dual-Density Padding
In shoulder harness maximizes freedom of movement.

C - Cross Stay
Ensures the pack will not barrel under heavy loads.

D - High-Cut Dual Density Hipbelt
Integrates with a climbing harness.

E - Removable Padding In Hipbelt
Shaves weight (waist webbing is fixed and provides stability when padding is removed).

F - Thermo-Formed Backpanel
Fits snug against the back and sheds snow.

G - Anti-Slip Lumbar Pad
Correctly transfers loads to hips.

Gregory Packs Fusion Flex Technology

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