ALTNA Hard Shell Bag L

Comes with a pocket plate that is convenient for storing small items. It is detachable and the mounting direction can be changed.
The back can be folded down so you can access the contents without having to open the zipper all the way.
Comes with side bands that allow you to adjust the opening angle.
Shoulder strap can be attached. (A-7579 (sold separately) recommended)
Can store up to approximately 13.3 inch laptops.