I finally broke down and bought junk specifically designed for my car and I'm not disappointed at all. It holds the plastic bag perfectly with straps/buttons on the side to keep it from slipping off and staying in place. And even if you forget to grab another one to replace, it's a plastic material so it's easy to clean and I've had no issues with it leaking. The only thing I could have improved is that it had the same material on the sides so it stayed open to make it easier to throw things while riding. But at the same time it's very nice that they fold up and free up space when you have passengers.
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