wBest DARK GREY 15-15.6 inch Water-proof Laptop Backpack ,Multifunctional Luggage & Travel Bags Knapsack,rucksack Backpack Hiking Bags for, MacBook Air / Pro Retina Display[One Year Warranty] Dimension:18.9''*12.6''*7.5''.Water resistance nylon fabric with the top of your backpack more protection. Great for school, outdoors, camping and travelling. Large enough for your needs and classy enough to go anywhere you need. Durable polyester exterior and a plush Soft-Touch lining for extra protection Breathable ergonomic back panel diversion design, back up comfortable, relaxed shoulders, waist has a good protective effect. Mesh side pockets conveniently store water bottles within easy reach Can be installed under 12.1 "-15.6" notebook, laptop, do not worry about the interior too big too small annoyance.