【Expandable Design】Featuring a unique expandable design, this backpack can increase from 13L to 23L capacity, adapting seamlessly from daily commute to short business trips. 【Dual Fast Charging Ports】Equipped with integrated USB and TYPE-C charging ports on the side, allowing for convenient on-the-go charging (supports for iPhone 16 fast charging). 【Eight Functional Pockets】Efficiently organize your belongings with 8 dedicated compartments, including a large main compartment, padded laptop sleeve, wet/dry separation pocket, and signal blocking pocket. 【Reflective Safety Feature】Incorporates reflective fabric into the shoulder straps, ensuring visibility and safety during night walks or cycling without compromising aesthetics. 【Ventilated Back Design】Features a breathable back panel with airflow channels to prevent sweating and maintain comfort during extended wear. 【Luggage Strap for Easy Travel】Designed with a rear luggage strap, this backpack can be easily attached to your suitcase handle. Specifications: Model: 6634 Material: Oxford fabric + PU leather Weight: 1100g Capacity: 13L before expansion/23L after expansion Size: 43*30*(10-18)cm Maximum laptop size: 39*27*3cm