The sink itself is surprisingly light weight and I don't envision ever filling it up with water. It fits a maximum of four 16x20 trays, so that would be my limit. I guess the biggest weight variable is whether I'd use my 16x20 Gravity Works print washer in the sink. The washer has got to be 200 pounds when it's full. I might just keep it on a separate cart because I'm not even sure the built in ribs at the bottom of the sink would withstand the pressure. The storage on the bottom would be a good idea, since I'm short on space.