Witzman Unisex Vintage canvas rucksack backpack 6633 (One_Size, black) small size is 18.25"x12"x5.5",Material: Premium quality cotton canvas This bag also can use as a backpack,tote,cross body bag:The shoulder strap can be hidden if you don't like and can put into the secret pocket. This is a removable shoulder strap inside the main pocket, you also carry this bag as a cross body bag, and The main pocket also have a side zipper for your easy packing once you cross pack this back 3 Front pockets,a side pocket, a main pocket with a laptop computer window inside;A back secret pocket can put wallet, cellphone,ect.