i used Reptibark years ago and it was nice; definitely boosts humidity. only thing i didn't like was the price. i've since moved on to Reptichip, and it's AMAZING for humidity. it has more than twice the amount of substrate for the same price as a big bag of the Reptibark. for one snake tho, it's a LOT of substrate. if you go that route, you'll need a big bin to store it all in.