I tried several of these different polyester canvas bags. The problem with most of them is that nylon zippers and flaps melt. That doesn't happen with these bags. I pressed them at 385 for 1 minute on each side. The zipper must be protected from kinking. The zippers aren't the best. The pressure broke some of them. You should probably use an ab pad. Because it's canvas, the design is a bit blurry and "vintage", but that's okay. I machine washed one to make sure it was polyester and not actual cotton and it held up well through the wash.
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