Check out the cute miniature stapler set complete with 500 pieces of staples. The stapler measures to lxwxh = 2.5x1x2" and is petite enough to carry around your backpack.
Note: there are currently 2 versions of this product: blue and pink. If you would like a specific one, please email your request and order number to firstname.lastname@example.org within 24 hours after placing your order. Otherwise, you will be getting one randomly while supplies last.