When I'm hauling across a hefty parking lot, I use one of the bags that comes with those $10 outdoor chairs to host my tripod. The field recorder and preamps are also on an over one shoulder type strapped rig. And a man purse / day bag for extra batteries and media cards that goes over one shoulder. Not that any of those will host most mic stands. And not ideal for a long haul. I've thought about going with a golf bag that has back pack straps. If only to have a weather proof full coverage carry bag. Not that I've found any suitable yet. And with that much weight, you kind of have to ride slower than you otherwise might. If you're not crunched for space, you could go with one of those trailers. I just don't like having sensitive gear hardwired to the frame. Plus the extra weight gives you a little boost on your power strokes. And downhill inclines.
When I was a kid, I put my trombone between my person on my backpack. The bell kept it from sliding out and the weight kept it diagonal. And still a few gates and the likes (to the bike rack) that were tricky to traverse while riding the bicycle in that configuration. Suffice to say that you want more of a vertical carry than a horizontal one. Perhaps a BSA style hiking backpack. They had some pretty huge ones BITD that were super light by themselves. I generally avoid anything that stays with the bike as thiefs will be thiefs. I couldn't even go into a church without someone ripping open the zipper on my seat pack. Even though there was nothing in that pack. A royal PITB to rezip it to a functional mode after the fact. Not an issue in my current region since you don't know if there's a baby rattler in that bag, and are hesitant to find out.