Mountain Flyer UL Backpack Pattern - 40 L Spacer Mesh (Select your favorite color with

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Mountain Flyer UL Backpack Pattern - 40 L Spacer Mesh (Select your favorite color withDescription Note We're currently updating some of the labels within the digital delivery package to explicitly state "40L". The contents (material lists, sequence of construction, etc) are all correct and updated for the 40L build, but some spots may still say "34L". Sorry for the confusion! RBTR The 40L Mountain Flyer UL Backpack is a great place to start your DIY ultralight backpack journey. The backpack is light weight and relatively simple to