I use a Tamrac 750 Photo Day Pack which loads from the top. It with allows me to carry a Hasselblad 503 CX, 50mm, 80mm, 150mm and 250mm lenses, four film backs, four extension tubes, filters, film ... It transfers the weight to the hips so that you can carry a LOT of equipment.
Sometimes I put in my Hasselblad 903 SWC too. That covers your two MF camera requirement. There is also the Tamrac 752 Photo Day Super Pack.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.