New, Unused, Unopened [AISFA] Men's Backpack, Hiking Backpack, Square Backpack, Large Capacity, Waterproof, 15.6-inch PC Business Backpack, Laptop Backpack, USB Charging Port, 30L, Outdoor Bag, Travel, Commuting, Shoe/Lunch Box Storage 【30L Large Capacity & Efficient Storage】Size: (45+13)cm * 33cm * 18cm Weight: Approx. 1KG Capacity: Approx. 30L. Added insulated pocket. It can hold a 17-inch PC, A4 size documents, and enough items for 2-3 days of clothes, etc., and it is a large-capacity backpack with 19 pockets. 【Two-Layer Structure & Expansion Function】Packed with functions perfect for the "live and work while traveling" lifestyle, this is a unique backpack created by travel professionals. When you open the lower layer zipper, the capacity increases by 22%! Made of waterproof and breathable EVA material, it can store shoes, lunch boxes, and changes of clothes! Perfect for the rainy season and club activities! 【Excellent Cold and Heat Retention】AISFA backpack has added insulation to the side pockets. The insulated pocket is composed of PVC mesh + 10mm pearl cotton + thick aluminum film, a three-layer thick material, which is durable and keeps the temperature and freshness of drinks. 【New Charging Idea・2-in-1 Charging Port】Note: We have reflected and improved all the customer feedback we received in the old version. (Improvements: Added 2-in-1 charging port) A Micro-USB adapter and an earphone jack are built into the side of the hiking backpack, so you can charge while listening to music. 【User-Friendly Features are Also Abundant】Experienced commuting on crowded trains and cycling, and prepared for work style reform, this is an excellent product that has been improved with durability, design, and usability in mind. Equipped with a charging port, chest belt, and carry-on function, it is a smart and trendy transportation solution for your daily essentials. 【Multiple Pockets for Anyone to Become a Storage Expert】Overwhelming storage capacity! Equipped with the industry's most multi-functional 19 storage pockets! Packed with a variety of pockets convenient for sorting luggage. 17-inch laptop can be stored.