Yes, I made two of them, both with chevron canvas fabric. I made one first to be sure it worked and then the other to be sure and to write down all the details for next time. I first added the height and then divided the lining in two parts to insert the zipper. Of course seam allowances for the zipper were added too. For the top portion I used the exterior fabric since it's going to be in the exterior. Here's how it looks from the top.
I used wide handbag zippers (#5) and added a zipper tab at the other end. I also topstitched the zipper seam towards the lining so the zipper won't get caught on the lining fabric. I made both a slip pocket and zippered pocket inside. A key chain holder was added too since the bag is big to facilitate the search for the keys.
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So, what do you think about this addition to the bag?