We were accidentally shipped an extra 18" cabinet with our kitchen remodel. My GC suggested that I could use it for our laundry room. What is the largest, deepest sink that will fit? Is that too small?

I plan to use the sink for soaking heavy stains and washing delicates. I usually do small batches of delicates, but I often need to soak cat puke out of duvet covers. The whole cover doesn't have to be submerged, but it's still pretty big. The total counter width is 48". We are leaving an empty space to the side of the cabinet for the litter box. The alternative is to go with our original plan for a 24" cabinet and larger sink.

Using the 18" cabinet and smaller sink could be good cost savings unless the sink is so small that it's not very useful and I end up ripping it out for the larger size. What would you do?