I went to Lowe’s, a home improvement/hardware store in the US, and bought a heavy duty shoulder bag made for carrying electric saws, drills, etc. It has a hard bottom, a zipper opening for two divided pockets and small pockets inside the main divisions and on the outside. I think it cost about $40. It holds a body, several lenses depending on size, backs, film, meter, filters, etc. it’s worked well for me for more than a decade.
I did something similar to carry my RB67 or my 4x5 inch wooden pinhole cameras.