Author Topic: Back-pack advise needed  (Read 199 times)

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Bentneedle

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Back-pack advise needed
« on: July 05, 2019, 08:15:11 PM »
I need suggestions on the type and thickness of material/foam used for the back of a back-pack that goes against a persons back.

 

stimpy

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Re: Back-pack advise needed
« Reply #1 on: July 06, 2019, 02:06:46 PM »
It would be usefull if you could give some more info on the type of pack, how many liters? How much weight will it bear ?

 And from my experience in hauling around ridiculous amounts of weight as a soldier. Most of the comfort is on the shoulderstraps.

Bentneedle

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Re: Back-pack advise needed
« Reply #2 on: July 06, 2019, 09:05:12 PM »
Its a basic clam shell style pack that measures 13" x 18" x 7".

 The pack is to be used similar to a 3 day assault pack, so the amount of weight that it will carry comes down to what ever i can carry without the pack falling apart. 

I need some advise/suggestions for material types and thickness of foam  to be used  for the back of a backpack. 

i do have another question. What brand or model of machines are you guys using to sew your straps and backpacks.  I originally thought of going with a closed cell foam that is 3/8" thick for my shoulder straps  but none of my machines can sew something that thick. 


Thank You bentneedle


smeki

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Re: Back-pack advise needed
« Reply #3 on: July 06, 2019, 09:28:34 PM »
well, thicker doesnīt necessarilly mean more comfortable. For your backpanel you donīt really need IMO very thick padding (especially if youīre going to use backpack with vest/PC). In attached picture is my latest backpack similiar in size to 3DAP, backpanel is very simple with very little padding (8mm thick) and so far I had no problems
When it comes to shoulder straps it is important to make them properly curved and rather wider than thick.


Misadventure Gear

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Re: Back-pack advise needed
« Reply #4 on: July 07, 2019, 11:20:45 AM »
A lot of CCF you find laying around is lighter weight and breaks down faster. I think it's called 2# density or something similar. For shoulder straps and back panels, you'll want a denser, 4# foam. For personal projects where you don't need a large amount of foam, look to camping foam sleeping pads and yoga mats. Spend a few minutes checking them out at your local store, and you'll quickly see the difference in densities. If you're after production volumes of foam, look into plastazote or Volera in the 4# density

Bentneedle

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Re: Back-pack advise needed
« Reply #5 on: July 07, 2019, 10:46:37 PM »
Smeki; may i ask what type of machine you use to sew your backpacks? 

Misadventure Gear

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Re: Back-pack advise needed
« Reply #6 on: July 08, 2019, 12:34:36 AM »
Look closely at Smeki's pack. He isn't sewing through the foam. The shoulder straps look to be sewn inside out, flipped, and then the foam inserted. Same with the back panel. He edge-stitched around the foam. If you're struggling to sew through the foam, then you need to tweak your design to eliminate that.

smeki

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Re: Back-pack advise needed
« Reply #7 on: July 08, 2019, 06:34:11 AM »
machine used is Siruba L918-NH1. As was mentioned i didnīt sew through padding on backpanel. First i created "pockets" for padding a then closed the pocket. shoulder straps are separate pieces and donīt go all the way down hence the 1" webbing. Only step when I sew through padding is stitching webbing to shoulder straps (but you can avoid this)

cdhtac

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Re: Back-pack advise needed
« Reply #8 on: July 16, 2019, 11:23:12 PM »
Here's my standard backpanel; the padding is inside the spacer mesh pieces (made of two layers; top layer from spacer mesh, bottom layer from 500d cordura). Also the panel those pieces attach to, has closed cell foam inside of it, but no need to sew through.

The padding inside the spacer mesh pieces has a 1,5cm seam allowance so that i dont have to sew through padding in the seam, only spacer mesh

Just like Misadventure gear said;  you can work around problems simply by designing the backpanel a bit differently.



Bentneedle

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Re: Back-pack advise needed
« Reply #9 on: Today at 01:23:49 PM »
That is some really nice work. I am finding that I need to do several things different on my simple back pack.

Please keep sharing; You are helping learn a new skill set in back pack making.

Thank You

Bentneedle