One of the first two designs made of eco-friendly fabric Basic Backpack-o-Pet was added to the collection in 2008. With the exception of the external back compartment it has all the essential features to make this the most versatile design amongst all Celltei carreirs. Interior Lining Color/Material: Black (Camouflage). Mesh Color/Type: Green Camouflage - Smooth mesh with Camouflage Pattern. Size: Small.