Suitcases.... that's a new one!
I have a samsonite polycarbonate that has so many stickers on it, I have travelled a fair bit with it, it's been to some very interesting places and been abused by many airport staff!
I also have a smaller Delsey ultra lightweight one which by luck fits so snuggly in the zed it's like it was made for it. Jayne has one too and they sit side by side brilliantly! And it has cool wheels! I doubt if a custom pair could fit better.