INSULATED LEAKPROOF COOLER FUNTION：Our Lunch Backpack not only keeps warm but also keeps cold drinks for about 2-4 hours. The quality insulation layer of lunch box compartment keeps fresh and warm, which makes it easy to clean. Travel backpack cooler bag is suitable for office,picnic,beach,trip,travel,outdoor&indoor. Dimension of the cooler compartment: 11.8 x 7.8 x 7.8 inch | Large Capacity USB Charging Port: 2 Large compartments give excellent protection for 2 laptop computers and tablet.Largest main compartment hold for 2-3 days travel clothing.Many hidden pockets can accommodate lots of travel accessories,notebook, personal toiletries,side Zipper pocket for Easy access essentials, external USB port with set-in charging cable offer convenient charging your cellphone and other electronic devices.A hole for headphone outside gives easy access to Earphone usage | TSA approved RFID ANTI-THEFT: Unfolds the extra large backpack 90-180 degree making you quickly through the airport security and keep items tidy,Designed for airplane traveling. The big backpack perfect for indoor/outdoor activities,Served as college backpack.RFID Pocket with RFID-radio frequency identification help secure personal data encoded on you credit cards,IDs and passports.The anti-theft pocket on the back of backpack,easy to put your phone, purse and passport | Back Luggage Strap Chest Strap: Back U-shaped ventilation design help for the air convection. Adjustable shoulder straps with padding help relieve the stress from your shoulder. A luggage strap allows backpack fit on luggage/suitcase, slide over the luggage upright handle tube for easier carrying;The Adjustable chest strap bring the shoulder straps in tighter to the chest. Also, the laptop backpack with a sturdy rugged handle with steel cable on the top for carrying | MATERIAL SOLID: Heavy duty XL backpack made from quality polyester nylon fabric, with heavy-duty two-way waterproof zippers across the backpack are convenient to operate on whichever side you prefer, for a secure and long-lasting usage everyday/weekend. A rugged handle with steel cable on the top for easy carrying, Side compression straps keep the versatile stylish backpack at whatever size you requires