INSULATED LEAKPROOF COOLER FUNTIONOur 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