Just ordered the Basil design sport trunk. Tired of wearing a backpack to carry my stuff.I bought a Basil (Dutch company) one. It was pricey but nicely made and attaches to rack securely. It includes the adapter plate and key. I have it on my bike but haven't ridden with it due to weather, Got it from Amazon: https://www.amazon.com/gp/product/B075DKCKVX/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
I like them very much. Expensive, but well built. With the MIK mount system installation and removal is so easy too. I always carry a lot of stuff in mine from tools, tubes, locks…always nice to have what I need. With an e bike, you will hardly notice the extra weight of the bags.How are you liking your Gazelle panniers? My local LBS had a set and we set them on the back of the Gazelle Ultimate we were buying to see how they looked. Seemed Ok, but I have never had panniers so i didn't know what to look for or how to evaluate them. I have always used trunk bags, so I am curious.