Introducing the NNEOBA Laptop Backpack Bag for Men, engineered for ultimate security and convenience. Product Information: Model 15.6inch: Crafted without USB functionality, equipped with a reliable padlock for added security. USB 15.6inch: Enhanced with a built-in USB port for easy charging on the go, paired with a robust padlock for maximum protection. USB Upgrade: Elevate your experience with integrated USB charging, fortified by a sturdy padlock and an expandable structure for added versatility. Features: Premium Splashproof Material: Carefully chosen for its durability and resistance to water, ensuring your belongings stay safe and dry. Dual-Layer Anti-Theft Zipper: Engineered with double layers for enhanced security, complemented by a free padlock for added peace of mind. Spacious Interior: Designed to accommodate all your essentials with ease, featuring a dedicated earphone hole for convenient access. External USB Charging Port: Stay powered up wherever you are with the external USB port, though please note, the power bank is not included. Expandable Structure Design : Enjoy additional storage space with the expandable structure, exclusive to the "Upgrade" version of this backpack. Experience the perfect blend of security, functionality, and style with the NNEOBA Laptop Backpack Bag for Men.