The 40L Mountain Flyer Ultralight Backpack is a great place to start or continue your ultralight DIY backpack journey. The backpack is light-weight and simple to make. If made correctly it is extremely durable on the trail.

This build features the classic Mountain Flyer silhouette, shock cord compressible side pockets, y-top strap, hip belt, front and side lash points, front mesh pocket with buckle closure, padded back panel, and whatever else you want to add/remove for your personal needs.

You can have confidence in using the core pieces of this pattern while modifying pockets, lash points, etc. as you go. Have some fun, will ya?!

Looking for videos to guide you through the build? Check out our Video Lesson here! (The 34L Video Lesson has the majority of the same build instructions as the 40L backpack. An updated lesson will be coming soon!)

*This is a PDF Download, not a physical pattern

Dimensions	US	Metric
Volume	2440 in³	40L
Width	10.5"	26.5cm
Height (Open)	33.5"	85cm
Depth	8.5"	21.5cm

Other Dimensions
Shortest Closed Height	20"	51cm
Torso Length	19"	48cm
Shoulder Strap Length	18"	45.5cm
Hip Belt Length	29"	73.5cm

This Pattern Includes

Large Format Print

Letter Format Print

Material List

Sequence of Construction

SHOPPING CART

title

Make Bad Ass Bags

Make Bad Ass Bags

LEARN TO MAKE BADASS BAGS

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Lesson: Mountain Flyer Ultralight Backpack – 34L

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