I've used a Ruxxac luggage / sack cart when I used to transport my Sinar box and tripod around.
It was good in that it folded flat to stick in the boot (trunk) of the car. It had bungee ropes on to strap the things to it. It wasn't much use over rough ground as you could get it see-sawing before it turned over sideways if you weren't careful but it was OK on roads / footpaths /floors etc.
The tyres on those are solid so no chance of them going flat but the flip side is that there's not the same amount of bounce / softness in them so things have to be decently padded in the case / backpack etc.
For attaching a backpack, you'd have to make sure all the straps were not loose as they could get caught in the cart wheels being that close to the ground.
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