If you need a cool backpack then this Doctor Who Tardis Time Lord backpack.
This maybe not the backpack you expect but that makes this an amazing backpack.
The backpack has a design with Gallifrey symbols, the Tardis, and words like Tardis and Time Lord. And you will find the same design on the adjustable straps too but the front pocket is just simple and black and that makes this a cool bag with a side pocket for your water bottle.
The Doctor Who backpack is 12 x 17 inches making it nice and big so that it can keep a lot of stuff with you on you back.
Get your Tardis Time Lord Backpack