Design flaw

Nice looking, well constructed, but unfortunate design. I bought the medium size and installed it close to the bottom of the bike seat, as shown in the pictures. Then I found that I can't zip and unzip the opening because it's too close to the bottom of the seat. I had to install it loose, hanging an inch or two below the seat, in order to use the zipper. Now it takes two hands to zip and unzip the opening and it doesn't seem very securely attached, swinging side to side too much for my preferences.

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