SwissGear SA1118 Green with Black Backpack Large Packing Capacity: The main pocket provides protected packing capacity for multiple binders, gaming peripherals, and other accessories Audio Interface: Internal pocket includes a special pouch for MP3 players and headphone plug connects with external headphone port Shoulder Strap System: Specially countoured shoulder straps are ergonomically designed with added padding for confort and control Mobile Phone Pocket: Elasticized mesh pocket expands to secure most cellphone on shoulder strap for convenient access Airflow Back System: Multi-panel airflow design provides extra padding for comfort and minimum back support