The slim, water-resistant olive Military Tech 13" Laptop Briefcase from Naneu is a lightweight case that includes a hidden and detachable messenger strap that converts the laptop case into a functional sling messenger bag. If you have no need for the messenger strap just unzip to remove it and you have an additional pocket.
Naneu's Military Tech series is constructed from water-resistant 1680D ballistic nylon with inverted YKK zippers. The laptop sits in a dedicated compartment that is reinforced with polyethylene boards. There is also a spacious exterior pocket with an interior organizer, which includes a phone sleeve, pen loops, and extra interior pockets with room for files, mobile accessories, business cards and more. In addition to the messenger strap for carrying the case, there is a removable, adjustable, padded shoulder strap, a dual-grip handle, and a trolley sleeve for attaching to luggage.