Randy, are you looking to remove the current fabric pocket on the Jam, and replacing it with mesh? It's kind of a big project, but very feasible if you have a couple days of free time on your hands. In terms of method of attachment, I don't really see anyway around taking the pack apart at the seams, and resewing with the mesh pocket in place. Hence, the need for a couple days of free time.
I use this stuff...durable, and pretty much the same stuff used by major manufacturers.
From Quest Outfitters:
#1209C LYCRA MICRO MESH , (Black)