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jontea-
1mm, which felt like overkill if anything. Directplastics did a 250mmx500mm sheet that was perfect for this bag.
Just that single stitch at the front/top. The plastic then just fits in a compressed u shape and gives it a pretty solid structure. For more stout Carradice materials you might not even need the front stitch, as a canvas seam might be enough to just tuck it under at the front.
crow
Some hdpe plastic and some waxed thread later it is installed, and the bag now stands up on its own when empty. The plastic butts up against the dowel at the back, and needed a wonky stitch at the front to keep it in place.
Thanks to those in the Carradice thread who discussed this some time ago i think, and I lodged it all in my brain, ready for this moment.
Not sure yet yet whether this will go on the front or the back. It’s too wide with pockets for the front, but if the pockets can be secured flat it’ll fit. Will have a play around.