This 12-15L expandable small hiking backpack is an outdoor all-rounder, designed for explorers who pursue lightweight and functionality. Made of 400D high-density nylon fabric, it weighs only 0.75 pounds but provides excellent waterproof and tear-resistant protection, making it easy to cope with bad weather. 10 smart partition pockets include a dedicated mobile phone pocket, earphone compartment and energy snack bag with reflective strips (for hanging sunglasses), with an adjustable chest strap and built-in safety whistle, so that your equipment is within reach. The innovative expandable design meets different capacity requirements. After folding, it is only 8.66×8.07 inches in mini size, but it can be instantly unfolded into a professional hiking backpack. Whether it is urban commuting or mountain crossing, this backpack with an ultra-light weight of 0.75 pounds, military-grade protection and humanized design will become your most reliable travel partner.