This is a Marvel Spiderman All Over Print Square Nylon Backpack made by the good folks over at Loungefly.
It measures roughly 12 inches wide and 17 inches tall. It's made of durable canvas material and has a great Spiderman-themed design.
A great backpack for any fan of Spiderman!
12" x 17" x 5" X Loungefly Marvel Spiderman All Over Print Square Nylon Backpack