Backpack design

My project is to design a backpack for everyday use. I am looking for an item that is lightweight and has a medium size. It would also be great if the backpack had a laptop compartment and was waterproof. I need the backpack to be light and comfortable to carry, suitable for daily use. I also need it to have enough storage space for carrying my laptop for work or school. This design is a unique and practical item that is sure to meet my needs. The straps need to be magnetic to have something different in backpacks pattern. The material for this item is Eva.