Would the 3 pack of this ( 21 liters ) be enough to give a good 4 - 5 inch substrate height for a russian tortoise in a 36 x 18 x 19 enclosure?
http://www.petco.com/product/10813/...xpandable-Substrate.aspx?CoreCat=OnSiteSearch
http://www.petco.com/product/10813/...xpandable-Substrate.aspx?CoreCat=OnSiteSearch