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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.
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What thickness HDPE sheet did you use? Stitched back, front and base?