Cuben Backpack

That looks great, awesome job.

So you exclusively sewed all the seems together or did you use tape/glue/etc?

your pack turned out great, I like the idea of the two back pockets.
great job!

Yeah I dig the dual pockets also. Good work.

Phil, good question. I exclusively sewed the pack, like I would silnylon. I added diagonal reinforcement at all of the pressure points. The idea is the Spectra threads are aligned horizontally and vertically, so the diagonal patches add the needed durability much like Dyneema X Gridstop does. Time will tell…

Nice Job on the pack.

John,

This looks fantastic, man. And it's even so light, you were able to attach that lighthouse to the bottom of the pack. Is that so the pack won't float away?

What kind of attachment did you use for the lighthouse?

Dug

Thanks for sharing! Where did you buy your Cuben material?

Thanks again, Steve

He probably bought it from Zpacks.com who sell the 1.5oz cuben by the yard ($29). I don't know of anyone else that sells the 1.5oz stuff:
http://zpacks.com/materials.shtml

Correct, Joe from ZPacks has been great to work with. Very good customer service! The material is very difficult to cut, but great to fold and sew…much easier than silnylon.

As for the lighthouse, I guess that was decadent bringing decorations just because the pack is so light and tough. :)

Your pack is inspiring! I'm about to attempt to make my first cuben pack. I had a couple of questions, if you'd be so kind as to share your technique:
–How is the bottom sewn? Is it a stuff-sack, "roll three times and sew" kind of construction or something more complex?
–what kind of stitching do you suggest for securing the pack straps? It looks like the bottom of the straps are sewn into the pocket seam. Are the top straps "x-boxed", triple stitched into the reinforcement patches or something else?
Thanks for sharing your project with us, John.
-Greg

Hi Greg,

Thanks for the kind words!

The bottom is sewn similar a stuff sack, rolled once and triple stitched. Then I square off the corners, again similar to a stuff sack, to give the bottom its square shape. The long seam against your back is felled (double stitched).

I've read all the bad things about sewing cuben, the stitches pulling out and such. I have to say, with this thicker 1.5oz/sq yd material, it's just not the case. The material actually does very well with bartack stitches. I originally had sewn the top of the straps to the pack with an x-box stitch, but the thread was actually breaking (not the fabric). I think this is because, unlike silnylon, cuben does not stretch at all. I went back and bartacked the entire x-box, and have a super tough connection now.

Yes, the bottom of the straps are sewn into the pocket, with some cuben backing on the inside as well. These too are bartacked. I made another one of these packs for a friend, who prefers a hip belt, so in this case the bottom of the straps are sewn directly onto the hip belts as seen in this photo…

I hope this helps! Good luck on your pack…looking forward to seeing it!

This is very helpful, especially with the fabric layout to display the relative dimensions of each piece. Thank you so much.

Can you tell me if you sealed the stitch lines for waterproofing? And if so, what sealer did you use?

I have a yard of 1.43 oz/yd cuben. Is that a little too light for a backpack? I have mostly read heavier such as yours at 1.5 oz/yd.

Jama,

1.43oz and the 1.5oz you are reading about are the same. Most people waterproof the seams with cuben seam tape or Seamgrip.

Ryan

Jana, check out John's website for more info and pics of his cuben backpack. Here: http://www.mountainultralight.com/2011/09/make-your-own-cuben-fiber-backpack.html

I asked him by email a long time ago about whether he seam sealed the pack; he replied that sewing the straps and tie-out points created more holes than he thought was worth it to seam seal so instead he used a 0.5 oz cuben pack liner that had been seam sealed.

Hope that helps.