I use cypress mulch in the open end of my big cages, but I put it in a big Rubbermaid tub. I have newspaper in the hide end of the cage. My Dry's spend a good bit of time in the tub with the mulch. That way, they still have plenty of room to crawl around be cause the tub only takes up about 1/4 of the area in the open end, and they don't end up getting mulch in the water, plus it's easier to clean up. I use newspaper on the floor under the tub.
In my smaller (4 foot) cages, they are designed to take a big Rubbermaid or Sterilite tub that covers the whole side of the cage, so 2 of them actually serve as the cage chambers. (It's hard to explain). On those, the hide end has the mulch and the open end has newspaper.
I like the tubs because it makes cleaning and sterilizing a whole lot faster and easier. The snakes don't seem to mind at all.