We adopted an old sandbox with no lid- needing none, as cats are coyote candy- when we first moved here. It has needed replacement sand every year...this year it was all box for a few months before it became warm enough to allow for new stuff. We went to Home Depot, a store I am very fond of, and our travels took us to the shower and tub section. Oh, they were hiding.
Lucy joined in, and Bowden desired that I should, as well. So I did, briefly. That shower is roomy!