Massage function - Built-in massage function that can be turned on by an adjustable button with a normal cell phone battery (not included), so you can relax and enjoy your trip with a massage. Large Capacity - Contains independent compartments for great storage and organization for different items. Multiple main compartments with many hidden pockets to provide the space important things need. RFID protection - RFID protection bag to protect personal data (e.g. from credit cards, passports, etc.) from theft by an RFID scanner. Patented smart USB charging system - Pre-wired USB port on the side of the backpack for quick and easy charging of smartphones or other similar devices (battery not included). Add-A-Bag system - Add-A-Bag system convenient your travel. A luggage strap allows you to connect your suitcase to the backpack and thus pull with one hand. Your trip will immediately become much easier and more pleasant.