The versatile backpack with indicator light is made of dense 600 D polyester. The indicator has 3 lighting modes: blinking, steady white light and red light. A button battery (3V CR 2032) for the indicator is already included. · Volume: 16 liters · Fits a 15 "laptop Description: · Durable and water-repellent material · The main compartment with a zipper with two sliders is located closer to the back, which will not allow thieves to easily open your backpack! · Inside the reinforced laptop compartment with protective tape on Velcro · Ergonomic shoulder straps and a backpack handle · The straps are sewn with additional straps in quick-wear places that can be adjusted in length and secured with plastic fasteners · Packaging: transparent bag