Unprinted newsprint paper for me. I can get as many end rolls (the remainder of a big roll that is taken off the press before it runs out) as I want, since I work at a newspaper. I fold it up about three layers thick, and just keep a stack of them folded and ready - as soon as I see a mess, I can pull the snake and decorations, grab a clean tub, and have it ready in about thirty seconds. Then go pull the dirtied paper out and clean the tub ready for next time.
My Cal Kings are on shredded aspen, though, because they love to burrow. I tried the BP's on aspen, and they seemed to not like it. Both seemed much more comfortable with just paper.
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