I tried a short bin of sand and my girl tried it and rejected it. They like big bins of at least 12x12x12” even though the sand depth is only 5-6”. Maybe they like the secure feeling of being completely surrounded by opaque plastic. They don’t lay very often, so I don’t know, and it’s not something I want to experiment with.What’s the minimum size I’d need for it? And what kind of play sand?
You’ll want to use the type of play sand that is used for kid’s sand boxes - available at most home improvement stores.