MOUNTAINTOP Outdoor Sports Professional Clycling Backpack Daypacks Waterproof Professional Riding Mountaineering Bag M5848 Unisex 20L Trekking Travel Bag Rucksack Size: 45cm(H)*30cm(L)*20cm(W); Large capacity of 20L, breathable S-type strap,mesh belt, 3D carrying system Quality fabrics: quality polyester fabric, water repellent, tear resistant, wear resistant, breathable and moistureproof, smooth and comfortable SBS zipper, YNS buckle-cold-resistant and securely; reflective strip design, higher safety factor for night Designed specifically for cycling, more professional; Large front pocket, multiple zippered side pockets, and multiple elastic bands Rainproof surface, good for outdoor sports