SOCKO 17.3 Inch Convertible Three Multipurpose Laptop Bag Muti-functional Backpack / Briefcase / Shoulder Bag / Messenger Bag Include Strap For Dell / Toshiba / HP / Lenovo / Men/Women (Black+Black) Demensions: 18.1 x 12.9 x 5.1 inches, fits up to 17.3 inch laptop , like Dell / Lenovo / Toshiba / HP/ Macbook etc. Convertible Multipurpose Bag . This bag can convert to backpack, shoulder bag or briefcase, just you want it to be. So convenient for carrying. Huge and reasonable space . Main compartment is designed for keeping laptop , Tablets , clothes , umbrella etc, two front pockets with zipper for keeping item like wallet, key, power bank, etc. Inside the main compartment, there are many small compartments for laptop power cord, books etc. Function of Water resistance and shockproof. The durable Oxford Cloth and the 210D Waterproof Polyester Lining inside provide the function of water resistance and shock proof. Also the foam padding inside the bag further enhance the shock proof function. Include removable shoulder strap and backpack strap. The shoulder strap is removable and adjustable, fit for every peoples. Also the backpack strap can be hidden in the back compartment when you dont need a backpack carrying style, still keep the bag in good shape.