This Dear Friends this is a Swimp medium size backpack that will fit a 15'' laptop!  

• The Fun Measurements are  H 16⅞", W 12¼", D 3⅞"
• It is Water-resistant ( Made from 100% polyester ) 
• Assembled with a interior pocket for a 15” laptop, front pocket with a zipper, and a secret pocket with zipper on the back of the bag
• Silky lining, piped inside hems, and a soft mesh back
• Padded ergonomic bag straps from polyester with plastic strap regulators