CONVENIENT USB&HEADSET PORT DESIGN：USB interface with built-in cable design, great convenience for charging your electronic devices via connecting your own power bank. And the headphone interface frees your hands when enjoying audios, music, etc.(PORTABLE BATTERY IS NOT INCLUDED) ANTI-THEFT DESIGN: With Fixed Password Lock and Durable Metal Zippers, it is safe guaranteed for protecting your valuable items inside. No need to worry theft easily opening your backpack when you are travelling or lining up. MULTIPURPOSE BACKPACK: High quality Water Resistant Polyester Fabric Material & Practical luggage Strap design & Comfortable Widen Padded Shoulder Strap & Built-in Key Ring design, fits for daily use at school, college, business and travel, suitable for women, men and students. LARGE CAPACITY：External dimensions:Multiple divider pockets, easy for holding 15.6 Inches laptop, water bottle, readers and a bunch of other items, iPad, journal, pens and pencils, iPhone.