I actually have a quick release beam but don't want to drag it around on travel. That's why I liked the collapsible bag with the seat post mount, so it fit easier in the suitcase. The rack is heavier than required for the support I need. It's collapsible, large and holds it's shape when in use (not saggy). I almost pushed the button on a cool Topeak seat post mounted bag, but I think it's soft but stays in a clamshell shape. It is huge, I saw a helmet loaded in it in a photo.

Thanks for the suggestions though. I have an old mountain bike that might become a donor. I gave it to my daughter and she says the front shock is blown. I'm not so sure of that but if so it will start being stripped soon.

With all the variation of equipment out there I am surprised sometimes at what's not available. This wouldn't be just folder equipment.