Another thought against the towel velcro option is the velcro would have an adhesive backing that is going to come lose and the last thing you want in their enclosure is anything with adhesive on it. I buy the packs of unbleached packing paper from Lowes and fold it in half to line my tubs. makes cleanup a breeze and it's cheap and a pack lasts me about 2 months, even with 12 snakes.