Just plain drw 1.1 ripstop seconds that I had leftover. I forgot to give the dimensions of the uq - it's 60L x 45W. Any 1.1 - 1.9oz would work fine. I made the suspension channels from 1.9oz - they're 1.5" wide before sewing and 1" flipped out finished.
You can also use argon or any of the wonder fabrics - down proof isn't necessary.
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