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We made some for xmas presents this year (produce bags actually) with the drawcord channel mimicking the stuffsack from ULA's Amigo Filter. The channel is made before the bag is shaped as follows:
-The single panel lays flat. -The top corners are folded in about 2" and pressed or pinned. -The top edge is folded in about 1" and pressed or pinned. -One seam secures this channel. -The result is a channel with a doubled edge at entries and just one seam. -Finish sack according to your choice of flat, square, or round bottom.
The channel and seam can be strengthened by doubling or tripling the folds before the single stitch, but may make threading the drawstring more difficult. Work it out first by folding paper. It holds a crease better than cloth.
edit: Yes, exactly as Scott's picture shows. And I've now noticed this design on some non-ULA bags in my house.
Edited by tippymcstagger on 02/13/2010 10:07:48 MST.
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