15x13 Bag Leaf litter is a great addition to a hermit crab tank and Isopod enclosure. They thrive when leaf litter is present. . Our leaves are ready to use and hermit crab safe. We freeze and bake them making them ready to use in your hermit crab tank or worm bin. Composting worms will eat the leaves and give you amazing castings which is worm poop. At TheGardenAndWormLady, we've been raising the healthiest and best quality composting worms since 2002, ensuring your pets get only the finest. Pack size is 13x15 sealed bag.