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i kind of followed the instructions available at thru-hiker.com. i've never done synthetic, just down, but i just looked at the pattern there and then jumped in with my own measurements - approximately what was suggested. everything turned out well, except the footbox was a bit smaller than i had anticipated.
do you have scrap fabric? buy some bedsheets at a thrift store, hack them up and sew a prototype. good luck!
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