I just went to a local discount home goods store & got a small, rectangular wicker basket as a hide. It's big enough that my adult can turn around in it. If I had to guess, it's probably 14" l x 8" w x 4" h. I draped it with an old hand towel to block light when he was brumating. He loves the thing, so no need to splash out for something fancy (unless you want to, of course!)