Quality MateralMade of Water Resistant and Durable Polyester Fabric with metal zippers. Ensure a secure & long-lasting usage everyday & weekend. Serve you well as professional office work bag, slim USB charging backpack, college backpack USB Charging Port & Headphone JackBuilt-in USB cable. Use it to connect the power bank, then connect your phone with original USB cable to the USB port, you could charge your phone conveniently.And the headphone interface frees your hands when enjoying audios, music, etc. Anti-theft Backpack: Durable Metal SHACKLE with hidden design to protect your valuable items from thieves. Well made for international airplane travel and day trip. Durable laptop backpack antitheft bag ensure a secure & long-lasting usage everyday & weekend. Large Storage SpaceOne separate laptop compartment hold 15.6 Inch Laptop as well as 15 Inch, 14 Inch and 13 Inch Macbook/Laptop. One spacious front compartment roomy for daily necessities, tech electronics accessorie