I have seen your listing. You can make following changes accordingly.
>>>You have included in title ‘backpack’ but most of people search for school bags. So you change backpack with school bag. Otherwise, your listing seems good.
>>>This product listing is good. As I can see there is laptop compartment. You can include it in your title.
Keywords: Laptop compartment, casual school bag, adjustable strap, premium quality.
Use this keyword accordingly in title, bullet points, and lower area.