Large space and multiple pockets: Large black backpack size is D6.7" W13" H20" (17 cm 33 cm 50 cm), Perimeter 33" (83 cm), Weight 1.87 lbs (0.85 kg). The laptop compartment with shock pads can accommodate 13" 14" 15.6" to 16 inch laptops. The spacious middle compartment can store daily/work/school/college/travel/overnight trip supplies Material/Performance: Our tech backpack is made of high-density, lightweight, tear resistant, odor free, waterproof, colorfast, very tenacious first grade oxford cloth materials. When you travel with it, the rain will not wet your belongings. It will not deform in hot weather and not become brittle in cold weather, so it is more durable Brand designer: The dual anti-theft design of the flap top of the brand backpack and the pull rope makes your items security on the journey. The new generation product's back breathable pad can provide you with more support and relieve stress. The triangle reinforcement tec