Hide for adult female Borneo?

Well, my Borneo has outgrown all of the hides I have, and I need to buy her a new one, as she can't fit all the way into the one she has now. Would an upside down cat litter box be big enough? What do you Blood keepers use?

Thanks :)

I use a very large PLASTIC plant pot turned upside down with an entrance hole cut out.

I find these appropriate as tehy come in all sizes so its easy to change up as your snake grows.

I took a steralite and cut a hole in the side and melted the sides so that they didn't have any sharp edges. Based on how long that took me though, I'd recommend getting a plastic planting tray, plastic pot, or something similar.