Curved strap connection seam…how?

[Lance H]

I’m starting my 7th pack and each pack has been more complex and refined then the next. The one place I can’t seem to figure out from pictures is how folks are creating the curved seam on the back of the pack to connect the top of the shoulder straps.  Many manufacturers do this in certain ways, but the pack below shows it off the best.  Anyone experience with this? can you explain how you successfully create this seams?  when I do it I have been basically doing a flat felled with the top and bottom pieces cut with the same curve when “right” sides are facing.  Sew the seam and then when I flip the top part up it looks fine BUT it creates an equivalent curve in the back panel creating a convex panel pointing toward your back.  Hope I am explaining this so it makes sense.any assistance is appreciated.

 

The way I have been doing it for my previous packs is attaching the straps to a straight seam but angling them out some.  This sort of helps but it still makes the pack not follow the natural angle of the shoulder.

 

My most recent pack you can see the straps attached on a flat seam but angled out

[Aaron]

Does this explanation help? https://www.youtube.com/watch?v=Z9N8qlk0fjo

[Lance H]

Yes. Thank you. I had not found that video.

[Aaron]

No problem.  Alternatively you can also start by clipping the edges of one curve and pin the two pieces together if you’re not confident about being able to keep them aligned while feeding through the machine.

[Doug Coe]

I’m gathering ideas for my first myog pack and I figured I’d attach the top of the shoulder straps at angles like on packs from Waymark Gear Co.

Why make a curve instead of just an angle?

(not that) Doug

[Jerry Adams]

nice video Aaron, I will use that technique some day

[Lester Moore]

The seams to attach the shoulder strap need not be curved. The first image below is an alignment and spacing template I use to line up the two pieces of the back panel with both shoulder straps to make it easy to tape them together prior to sewing. The straps are attached to the back panel with three straight seams that connect (one seam with two bends in it). The key spacing is that the inside edges of the straps are 7″ apart at a distance of 4″ above the central straight line (3/1/4″ long) on the back panel. This spacing and angle seems to work well for the packs I’ve made so far. The back panel has two pieces of fabric, and the shoulder straps are sewn into the seam (second image).

 

[Doug Coe]

Aaron – Your second image is exactly what I was planning on doing. There will no curves in the main bag of my myog pack!

[Author]

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