Dotop Men's 3-Layer Backpack, Compatible with 17.3-inch Laptops, USB Charging Port, Expandable, Large Capacity, Multifunctional, with Chest Strap,

[High-Quality & Multifunctional Business Backpack] 1. Material: Water-repellent Oxford. Made from high-density Oxford fabric, this highly water-repellent backpack protects the contents from rain and dirt, making it perfect for sudden downpours in the city! 2. High-quality materials and reinforced stitching enhance the backpack's durability and ensure it's built to withstand long-term use. It's sturdy enough to withstand heavy loads, even during frequent commutes and business trips. 3. USB-A Compatible: Equipped with a USB charging port, you can charge your smartphone without removing it from the bag by simply placing your mobile device in the bag. [22 pockets, 3-layer construction, and expandable gusset for ample storage] Size (before expansion): 30cm W x 17cm D x 47cm H (27L) ⇒ Size (after expansion): 30cm W x 25cm D x 47cm H (40L); Weight: 1.26kg; Number of pockets: 22; Exterior pockets: 2 front zipper pockets, 2 expandable side pockets, 1 hidden rear pocket (anti-theft); Interior pockets: [First layer main compartment] 1 main pocket, 2 pen pockets, 2 small item pockets [Second layer main compartment] 1 main pocket, 2 open pockets, 2 inner side pockets, 1 pen pocket, 1 small item pocket, 1 mesh pocket [Third layer main compartment] 1 main pocket, 1 open pocket, 1 dedicated pocket for 17.3-inch PC, 1 tablet pocket [Expandable gusset, meticulous design] 1. 3-way backpack: Can be carried by hand, over the shoulder, or attached to a suitcase. Introducing the 3-way backpack, allowing you to change the way you carry it depending on the situation. It also has carry-on functionality, allowing it to be used as a carry-on bag. 2. With a total of three dimensions of less than 110cm, it is carry-on size and can be placed in the overhead bins or under a seat. 3. The shoulder straps come with a band for attaching decorative items, so you can attach glasses, key chains, and more! 4. Expandable gusset: Don't worry about carrying more luggage! Expandable from 27L to 40L! 5. Comes with a buckle-type chest strap to distribute the backpack's weight. Relieve shoulder and neck fatigue! [Ergonomic design for a comfortable, hug-your-back feel] The double-layered design, featuring a mesh, cushioned back panel and a central ventilation channel for breathability, reduces back stuffiness and ensures a comfortable carrying experience. The ergonomically designed S-shaped shoulder straps and the entire back feature thick cushioning and highly breathable mesh material for a decompression effect, reducing strain. Even on hot days, they effectively release uncomfortable moisture for a refreshing feel. The adjustable strap length accommodates a variety of body types. [Useful for a variety of occasions] The capacity is just right for commuting to school or work, as well as for trips and business trips of 1 to 3 nights. This large-capacity, versatile backpack can be used for both business and casual occasions, work, business, commuting, travel, weekends, shopping, hiking, and other outdoor activities.