Reddit mentions of SyFabrics Sports Football Jersey mesh Fabric 58 inches Wide Black

hyperd 300 from ripstop for the body, straps, etc... I did the amazon 3d mesh for the straps, putting in some 1/4 foam from ebay, the mesh I received today so haven't worked with it yet but seems super nice. Other random bits and things I got from ebay such as shock cord, etc... if not super important. For the 1/2" webbing I only use nylon webbing (don't like the polypro for it and can't remember where I got it from but need more).

I use 2mm Z-Line Dyneema Cord, LineLoc 3 WSR Side Release Buckles, and 3/4" Ladder Loc Buckles from zpacks now for the other bits.

Links:

https://ripstopbytheroll.com/collections/pack-fabric/products/hyperd-300-diamond-ripstop-polyester

http://www.zpacks.com/materials/hardware.shtml

http://www.zpacks.com/accessories/spectra_cord.shtml

https://www.amazon.com/dp/B00NUG12VC/

https://www.amazon.com/dp/B00N9I7NRI/

https://www.ebay.com/itm/1-4-x-29-x-60-Hi-Dense-CLOSED-CELL-Uphol-Foam-G/202282536215?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

For patterns I did my own... so far this is my favorite sizing:

https://drive.google.com/file/d/1ladOenCTqjnsUGmuZYlZkJJDZVXFA3VI/view?usp=sharing

I do a nutty 1" seam allowance but I think it helps me get some better lines.

Method:
-- I cut the fabric all out in the sizing.

-- Make the pockets, I sew the channels onto the mesh, add in shock cord, usually I do that length the same as the side of pack (not the pocket). Bar tack the cord in but leave about 3/4" from the edge.

-- I then tack the pockets to the side as well as the webbing for things like your sit pad, cord, etc...

-- make the straps and attach those to the back as well as the triangles... I bar tack the seam where they connect for extra strength

------ Straps: sew right side to right side and pull it though itself when done like a tube, shove the foam into it, bar tack on webbing and the ladderlock the way you want it

-- sew the sides to the back, then the front (with the large pocket) to the sides, all inside out so it's a big tube

-- sew on the bottom, I do the sides first then the front, then the back...

-- I cut away all the extra junk inside the seam (like webbing, pockets, etc) to 1/2" or about that. I just then fold the allowance into one another and sew on the edge.

-- I then feel where the stuffs at inside like webbing, pockets etc and run a quick bar tack on those for extra strength.

-- fold over the top once add velcro, fold again and sew it along the bottom all the way round.

-- bar tack on the line loc buckle with webbing

-- add cordage

-- go backpacking

Bar tackwise I just do the buttonhole setting at width of 5 and like 2-3 length... run it forwards then back a couple times.

The angle of the straps I did like they do on the g4 like so:

http://www.backpacking.net/makegear/gvp-pack/makeow11.jpg

I've been messing with s vs. j straps and think I prefer the s myself but that's personal preference. Here is a full size J I did based off of Zimmer's write up on BPL:
https://drive.google.com/file/d/1552JCmPH4oedr_3eqrqfyO3c_L7mmoiD/view?usp=sharing
for S I did a pattern using an SWD pack I had before I sold it.

Jump right in and have fun with it. It can be a bit nerve racking your first time but once you get that one out of the way you'll be whipping them out. I'm doing pack #5 right now, did a bridge hammock, many various pockets for buddies, some mitts, etc... the more you do it the easier it gets and after the first trust me you'll be hooked.

Good luck.