Features:
Anti-Freeze and Waterproof, High-density & High-quality nylon material
Anti-theft zipper, Double-layers four-teeth anti-theft zipper design
Reflective strip design, Safely walking or driving at night
4.0 USB fast charging port, Charges up to 20% faster than standard cables and transfers data at 800Mbps via USB 2.0
TSA Lock design, there isn't any key assort with the lock, the key hole is for customs inspecting to protect your backpack not be opened rudely.
Large capacity design, only the extend model can be expandable
Ergonomic back design, Luggage strap, back anti-theft zipper pocket and the breathable back cushion