12L→15L CAPACITY EXPANDABLE: This lightweight small hiking backpack optimizes the internal space utilization through three-dimensional cutting. One pull to expand capacity, the weight remains unchanged, and the capacity increases by 25%. Store notebooks and documents on weekdays, expand to load jackets on weekends, and meet the needs of multiple scenarios for commuting and short trips. ULTRA-LIGHTWEIGHT PACKABLE BACKPACK: The travel backpack weighs only 0.75 pounds, which is lighter than a can of Coke, but has a capacity of up to 15 liters. The included multi-functional detachable storage bag can be used as a toiletry bag alone or as a mountaineering bag. The hiking bag is only 8.66*8.07 inches when folded, which is light, small and easy to carry. It can be easily put into your suitcase, backpack or car. 3-IN-1 QUICK-ACCESS SHOULDER STRAP SYSTEM: The design of the phone pocket (can accommodate a mobile phone up to 7 inches) + headphone pocket (can place Bluetooth headphones, tissues, essential medicines and other practical small items) + energy acquisition pocket (place high-energy snacks) on the shoulder strap allows you to easily access them when hiking, cycling, queuing in the theme park or on a beach vacation. HIGH-QUALITY ACCESSORIES:This waterproof backpack adopts exclusive 400D nylon and custom zipper, which has 3 times higher tear resistance and is durable. The upgraded waterproof coating can meet the basic needs of outdoor activities. Equipped with an adjustable chest strap, it is suitable for people of different body shapes and heights. Exclusive embedded safety whistle, one-click call for help in an emergency, providing all-round protection for mountaineering/night running/cycling. 10 POCKETS AND PARTITIONS: Stay organized anytime, anywhere! This lightweight foldable backpack has 10 pockets, including 1 main zipper pocket with 2 inner pockets, 1 large front pocket, 1 small front pocket, 2 water bottle pockets, 1 dedicated phone pocket, 1 snack storage pocket and 1 headphone pocket. There are also reflective strips on the adjustable chest strap to hang sunglasses. ERGONOMIC DECOMPRESSION SYSTEM: 3D honeycomb shoulder pads disperse shoulder pressure, and adjustable chest straps keep the shoulder straps from slipping and share the pressure of shoulder weight. This packable backpack is suitable for women and men and is ideal for minimalist explorers, day trips, hiking or daily commuting. 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.