I used to have a tubular neck pillow filled with buckwheat husks, you could heat it up. My girlfriend at the time had me use it. She was a modern day hippie, marched to the beat of her own drum, and was sexy as hell.
Anyhow, if the 'bag' had structure, like a flat bottom, I think it could look a lot better.
I'm playing around with memory foam 1/4" thick on a Kinesis Contoured. Basically copy what they already do, just a bit more comfy:
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If memory foam is good enough for a bra (cloud of boobs) it should be a natural for a keyboard wrist rest....
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