Melting backpack

I'm looking for a new backpack. The one I currently carry is 20 years old, half dead and too small for transportation of school material.

And I must complain!! My search has not been nearly succesful. Basically, I want a douplet, but slightly bigger, cannot find...

Please have indulgence with my procrastination here, as I'm preparing for the chemistry exam that takes place the next monday.