MR Pop Up-Inspired Lumbar Pack (Build-Along)

[4090Sharps]

You probably wanted to save weight but when I built my copy of a kifaru ultralite frame years ago, I used a piece of 17337 webbing. It was probably 2 inch to accommodate about a 3/4 wide by 3/8 thick composite stay. I just folded under the bottom to create a long pocket. I believe it copied this from kifaru but I can't remember.

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Thanks man! I have a roll of that laying around if I need it. If you look at how the Exo K4 frame has an upper and lower portion, with stays that slide into the upper portion, that's basically what I'll be doing. I have some "hybrid" UHMWPE webbing that should make some nice sleeves or sleeve reinforcements for the upper frame. Assuming I don't just go all the way with fabric.

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At a weight of 6.3 grams/foot, our 1" Venom UHMWPE Hybrid Webbing is a full 30% lighter than our standard 1" polyester webbing for the same strength. Unlike our Venom UL Webbing, this variant uses a weave of both polypro and super strong UHMWPE fiber to increase friction and work with popular...

ripstopbytheroll.com

 

[4090Sharps]

I filled some slack time between work ending and picking up the kids by cutting some fabric for the lumbar pad. Going with 1/2" foam for the lumbar pad and 1/4" for the belt and shoulder straps. Once the foam is in the lumbar pad, I'll top stitch the "Slip Not" fabric in the middle to hold everything tightly together.

 

[4090Sharps]

Brown on brown doesn't show too well, but the lumbar pad is almost done. I'm going to attach the webbing for the shoulder straps and the top flap over them, and then I will finalize the lumbar pad height.

 

[4090Sharps]

Stopping for the night.

 

[4090Sharps]

One more picture for clarity. I've got some orange Ecopak that I'll be using to brighten up the interior for the opposing side--can't wait to work on that tonight.

 

[j43097]

bpthreadworks.com

Ben was really responsive when I had a question, shipping was fast, and the site says they are open to custom orders.

Ill second that, very helpful, fast, and the cheapest i found.

 

[4090Sharps]

The interior of the back panel is complete, and with that, I think the entire back panel is done. There will be hip stabilizers inline with the carbon fiber strips I sewed in, with the thought that they will counteract the force placed on the top of the vertical stays, causing the bottom of the stays to pull in the opposite direction.

The buckles you see here will connect to the load sling/cargo panel piece, pulling the side closest to the frame taut, inline with the frame, adding rigidity when hauling.

I'm still not entirely certain this whole removable frame contraption is going to work out, but if it fails at least I suppose I'll at least have a decent lumbar pack.... The further along I get, the better I feel about it.

Right now I'm a little worried about flipping the pack inside out after I bind the panels together due to the size and bulk of the back panel. It should be able to bend just enough to flip, but it's going to be tight.