Marvel Comics Superhero All Over Print Knapsack Back Pack Laptop Bag Marvel Comics Superhero All Over Print Knapsack Back Pack Laptop Bag Really sturdy Canvas with magnetic button style flap closure for main section. Main section features draw string closure under flap to be adjustable depending on how much you want to carry. Outside has 2 magnetic buckle style closure smaller pockets Measures approx. 16 x 13 inches