[Sewing] Sewing Craftsy Questions

[Ian Atha]

Hey craftsfolks,

For years now, I have been accumulating a collection of patches and
pins that I intend to proudly display on my backpack. However, I
change backpacks too often so I decided to go with a layer of
abstraction.

I plan to create a rectangular piece of cloth, the "interface", that I
will sew patches and attach pins onto. Any suggestions for a durable,
yet sewable, material?

Where can I procure snap fasteners from? Is there a better suggestion?
I intend to attach a few female snap fasteners on each backpack I use,
and just switch the "interface" from backpack to backpack.

This sounded way less nerdy in my head.

Thank you!

-ian