Exactly what I was looking for!  Now I can sort everything as I go and bring the bin to the laundry area (or wheel the whole cart if it’s laundry day).  Pretty sturdy construction with heavier weight casters (vs small/flimsy plastic which are usually attached to the pvc/mesh laundry carts), and the laundry bags are well constructed w/handles are easy to grab/padded.  I’m not sure how well it will do when fully loaded as I just assembled it today, but I’m definitely hopeful.