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Mesh back system
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Jonathan Price
(notclive) - F
Mesh back system on 04/09/2012 14:52:18 MDT Print View

Has anyone made a pack where the only thing in contact with your back is mesh and the pack itself is kept away with a curved frame?
Like this.
I know a lot of commercial backpacks have this type of back system, but I've never seen a MYOG version.

Edited by notclive on 04/09/2012 14:52:50 MDT.

K C
(KalebC) - F

Locale: South West
RE: on 04/09/2012 14:57:45 MDT Print View

What kind of mesh is that? It must have no stretch to work, I like the idea.

Samuel C. Farrington
(scfhome) - M

Locale: Chocorua NH, USA
Mesh back system on 04/09/2012 23:08:30 MDT Print View

Jonathan,
I've made two, one from scratch, and one using an old, worn out Alpine Designs pack.
They both had hour-glass frames, ABS for the Alpine Designs, and ALU for the one from scratch.

It was very hard on the one from scratch to get the tension on the mesh backpanel high enough. On the other one, I had the benefit of the manufacturer's design by cutting it up and using the fabric pieces as pattern pieces. The next one that I'm working on now will have a Fibraplex hub and carbon rods bowed out to the edges of the back panel, keeping it highly tensioned (I hope). If it works, it will be posted. If not, it will go into the scrap heap of history, and I will buy the lightest Osprey with a tensioned back panel that is big enough for my stuff.

These pics don't reveal much, but may be of interest:

AD pack

Jpack

The new one will have the same design as the second one, a Jackpack suspension with side arms, a shelf up top, a reach-up bottle pocket right behind the head, a zip open drop panel on the front under the shelf going down about half the height of the pack, and a suspended pocket for small stuff under the shelf in front of the bottle packet and accessible when the drop panel is unzipped part way. The idea is to be able to get to the small stuff quickly without having to unpack, and without having pockets sewn onto the outside of the pack. But the new one will be much lighter. The carbon rod weighs between .375 to .5 ounces per running foot, compared to close to 1.5 ounces for 5/8" O.D. ALU alloy per running foot. And it will provide the tension on the mostly mesh backpanel without having to install lots of little straps and buckles to pull the panel taut over an hourglass frame.

Edited by scfhome on 04/09/2012 23:11:32 MDT.

Colin Krusor
(ckrusor) - M

Locale: Northwest US
Mesh on 04/10/2012 13:02:56 MDT Print View

Jonathan, you could consider giant 3D spacer mesh instead of the "trampoline" design. Giant spacer mesh, 1/2" to 1" thick, is available as large sheets for providing airflow beneath mattresses on boats and as small sheets from at least two companies that use it for recumbent bike seats. It doesn't compress like the standard 1/8" spacer mesh. It maintains a space that air can pass through just like the suspended mesh in the trampoline design, but it doesn't require any kind of frame. I'm making a pack with it now. I posted a thread about it here:

http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=55938

Jonathan Price
(notclive) - F
. on 04/14/2012 11:04:00 MDT Print View

Thanks Samuel, hope the carbon version works out.

Edited by notclive on 04/14/2012 11:05:49 MDT.