Here are pictures of my Pannier/igloo.
All standard hardware parts.
The top connections are oval shape rings that open and close with a hex nut.
The clamps to the frame are water pipe clamp adjustable with a screw.
At the top are insulated P clamps from electric sections.
The bottoms are tied by bungee cords.

As you can see, the bottom plate of the igloo comes of and the thing folded.
You can see the telescopic handle in 1 of the pictures.
The frame, legs are riveted into storage. The storage is made of strong material to keep hot/cool.
I tie-wrapped pieces of tire tube to avoid metal to metal contact between the rack and hooks.

I just order these items from REI for $10 each.
They have the dimension that fit my laptop, and the pannier. I hope they work and I can load/unload my laptop/change clothes quickly.
Novara Laptop Pod Organizer
http://www.rei.com/product/780466
Novara Commuter Clean and Tidy Pod Pack
http://www.rei.com/product/78046

-G