Not the OP but I use a bag from Rhinowalk (I got mine from amazon for 85 Canadian dollars) that transforms from a pannier to a backpack and I love it! It's not the best backpack in the sense that only the top opens so it's harder to organize but I love it overall.

That's amazing! I just passed 1100km on my e-bike and I love it! Have you had to replace the battery after that many kilometers?

Genuine question: Why do we want gapless folding phones? If something gets in between the screens (like sand or something) and then you put your phone in a pocket isn't that going scratch a lot easier? I'm hoping to get a folding phone for my next device so I'm curious.