A simple example is when you hang the bag on a hook or doorknob and open one zipper, the rest of the backpack is upside down. This is a standard use case, but everything will slide out and need to be reorganized if I try this. Instead, I have to find a large flat surface any time I want to open it. I also can’t toss it into a vehicle.
https://www.amazon.com/AmazonBasics-Tool-Bag-Backpack-22-Pocket/dp/B079YRNSN4

