Trail running, road running, marathon, and lightweight trekking 90% highly breathable mesh fabric with reinforced stress points 3D ergonomic cutting: Vest-style pack designed with a higher center of gravity to distribute weight evenly across the torso, reducing hip and lower body pressure while enhancing comfort and mobility. ADF (All-round Dial Fit) system: Quick and precise adjustment via dial and lace system for a customized fit. BI-FIX system: Prevents water from sloshing inside flasks when half full. Layered compartment design: 14 storage compartments, including an independent compartment for a 1.5L water bladder. Double-layer mesh design stabilizes items and minimizes bounce. Dual trekking pole attachment options for flexible carrying. Breathable and reinforced construction: 90% mesh for superior ventilation; stress points reinforced with cotton thread for durability. Reflective details for night visibility and zippered pocket for important items. Built-in silicone tarpaulin in the bottle compartment for easier loading. Comes with 2 TPU 500ml soft flasks (each 38g) featuring a 360° rotatable diagonal bite valve for easy sipping and anti-friction design. Polygiene-treated mesh for antibacterial and deodorizing performance. Eco-friendly garbage drawstring bag included to help keep the trail clean. Weight: 220g (M) Capacity: 8L *Please note that due to different production batches, the product weight may differ slightly.