STM Saga Case STM-111-170P-01, Notebook Size 15", Polyester, Black, Water resistant, mesh pocket, Top carry handle, webbing loop, padded shoulder straps, External side water bottle pockets, Padded shoulder straps and grab handle for comfort. The STM STM-111-170P-01 is a Saga Backpack for 15-Inch Laptop. Like the features in our Saga backpack elements and amenities that have been inherited from predecessors on the STM family tree and are now iconic.