I use aspen. Some stuff is dustier than others. I used to use Zoo Med stuff which was nice but expensive. I use Alphapet aspen from Walmart now and it works fine. Not too dusty and a 20qt bag is only $3. Great since I do full cage cleanings once a month on all my snakes. The only downside to the stuff is it isn't as finely shredded as the Zoo med stuff. I've used Eco Earth, newspaper, paper towels and my 2nd favorite would be paper towels. Eco Earth dries out fast, then becomes really dusty plus if your snakes like to burrow like mine do sometimes, it will get plugged in their nostrils. Never used cypress because its pretty expensive up here and I don't have humidity issues with aspen and have used it for years.