Hi, I'm Brian. I have a Felt Bruhaul cargo bike with a Bosch Performance assist system. Owning this bike has made sustainable transportation possible for me. I made some aluminum pannier boxes to carry around my tools and dogs a while back. The boxes got so much attention that I made some more to sell. Here are some photos of a Benno Boost I built with 20" long, 31 liter, locking cargo boxes. Check them out and send me a note if you have any questions. Cheers!