Coconut fibre is a fantastic choice substrate for many reptiles and amphibians that require high humidity. The shredded coconut husk comes packaged in a block the size of an average house brick but after adding 3-4 litres of water it will expand to produce 7-10l of substrate.  It has a mild fresh earthy smell when re-hydrated and is excellent at absorbing and neutralising bad smells, It is especially useful for bulking up substrates to fill large areas.

1 block is enough to provide an even layer 1 ½ -2 in (3-4cm) deep in a 18x18 (45x45cm) enclosure.