I love !!!!! ATTENTION !!!! 15.6 inches is more than enough !!!!! it seemed a little big at the start bcp qd I received finaleT .... I am very happy because with all the stuff I need put in it to go to my classes .... !!!! Just one bag full of pockets rangeT, and especially especially the shoulder strap is just huge ..... it is great not strengthened it's great evils Shoulder !!!! RAS PART DO NOT BE SURPRISED BY ITS SIZE !!!!!!!!