I used a serger to do the seems with regular poly thread. The bar tacks are done with Bernina 950 on the zig-zag setting. All seams are in the inside. I did this bag as test and it's held up well but if you wanted to kick it up a notch you can buy Kevlar thread.

The line to close the bag is spectra, really strong stuff. I buy it at Into the wind

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