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Look what I found:
"Granite Gear had specially designed a pack for us to use for this trip based on our specs and the conditions we would be seeing. Weight, durability and comfort in hauling heavier loads were are main objectives when working with Granite Gear. We also wanted ease in carrying technical tools and our alpine kit. What they came up with is probably one of the most state of the art backpacks on the market today. Made of pure spectra dyneema and with a few accents of cuben fiber, the pack material has the perfect blend of durability and weight ratio. We knew we could not afford to have any sort of pack failure on a trip of this nature, so trying to cut corners and use traditional weight saving fabrics like silnylon, lighter weight cuben fiber, or even Codura nylon blends would not have been acceptable. The frame sheet Granite Gear put together is nothing short of remarkable. Made purely of carbon fiber and based off their award winning Nimbus Topflex line of suspensions, this framesheet alone cut around a pound off of the suspension. Total weight for the pack was around 33oz with a volume of around 50‐60L."
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