Eco Earth is a compressed coconut fiber that is ideal for burrowing animals. It can be used to increase humidity in an enclosure. Each Eco Earth brick makes 7-8 liters of substrate and is available in a single pack or 3 pack.
I'll never use another substrate again. While it may be a hassle to prepare, it is the best I have found for my banana ball yet. She loves it! It maintains moisture for weeks, and when it starts to dry out I just spray it down liberally and stir it in. 1 brick fills a 20 gal tank about 3/4 of an inch thick