High Quality 15.6 Inch laptop Backpack With Optional Removable Trolley Padded back panels, Sunglasses clip on one strap and mesh water bottle pocket on the side Zipped main compartment organizer pockets, zipped front compartment with small internal zipped pocket Laptop compartment is accessed from a zip on the side and can hold a large 15.6" with ease Removable trolley system slides in behind the back straps and Velcros onto the base to create a strong firm connection This case has comes with a removable trolley, providing greater comfort for when you choose to carry it on your back. With a large padded laptop pocket, organiser pockets, mesh water bottle pocket and sunglasses clip, this bag is multi-functional.