The bag has dual layers with reinforced seams for added durability. (sweetmomsblog.com)
I love the little touches like reinforced seam stitching - just like you would see on a pair of adult jeans! (thinking-about-cloth-diapers.com)
When you get to the part where the zipper is sticking out, stitch back and forth over the zipper a couple of times over the zipper to reinforce the seam there. (diaperjunction.com)