Instant storage system: industry's first design with a pulltab folding mechanism. Outdoor disaster preparedness: can be converted from a hiking bag to a compact bag size in three steps, allowing quick storage during sudden weather changes. Smart storage function: an expandable daytail that transforms into a capacity of 2.5 L when unfolded. Once folded, it fits into a special bag (included) so that a variety of portable methods such as a bicycle frame or hammock can be hung up. Made of lightweight nylon material, waterproof. Optimization compartment: in addition to the 30 L main compartment, there are 12 lower pockets distributed across the front, back, left and right. Equipped with a security pocket with a dedicated keychain, a waterproof pocket for electronic devices, and an elastic mesh side pocket. A practical layout that helps manage mountaineering equipment without loss. Load Distribution Technology: an ergonomic curved back panel optimizes load across the entire back. The interaction between the breathable mesh layer and the level cushion ensures breathability while reducing luggage movement. Use scenarios: Day hike or trek with variable weather: quickly convert to a compact bag when shelter or storage is needed; the 30 L main compartment plus multiple pockets hold essentials with easy access. Bike touring or hammock camping: expandable daytail provides an extra 2.5 L of capacity and can be hung on a bicycle frame or hammock; the included bag stores the daytail when not in use. Travel, mountaineering, or disaster preparedness: organized with a secure key pocket and a waterproof electronics pocket to keep gear safe, organized, and easy to reach.