Doctor Who Jack Tardis Large Size Rucksack Knapsack Laptop Back Pack Doctor Who Jack Tardis Large Size Rucksack Knapsack Laptop Back Pack Big section is drawstring close with fold over flap that has 2 magnet straps to close main section. Main section also has a smaller side zippered compartment, as well as two open pockets for cell phone, pens, etc. Outside has 2 nice size zippered side sections (good for water bottles) Bag measures approx. 20 inches tall by 16 inches wide