1、LARGE-CAPACITY -- Spacious compartments with 5L loading capacity is large enough for storing most daily needs such as laptop, tablet, purse, books, cellphone, water-bottle and umbrella. 2、BREATHABLE -- Excellent air ventilation system consist of porous mesh back and comfortable cellular cushion prevents stuffiness and releases pressure to your back. 3、LIGHTWEIGHT -- Quality polyester material is endurable and light, this professional Cycle bag design is different from other backpack that is with larger figure, it is simple and super lightweight that is good for outdoor activities. 4、SAFETY -- Designed with reflective strips on the back and the front that is conspicuous in the dark straps to keep you safe. 5、VERSATILE -- Suitable for all kinds of outdoor activities include riding, running, hiking, mountaineering, outing, etc. This is a professional Cycle backpack with large capacity capable for storing most necessaries for outdoor activities, suitable for riding, running and mountaineering. Features: LARGE-CAPACITY -- Spacious compartments with 5L loading capacity is large enough for storing most daily needs such as laptop, tablet, purse, books, cellphone, water-bottle and umbrella. BREATHABLE -- Excellent air ventilation system consist of porous mesh back and comfortable cellular cushion prevents stuffiness and releases pressure to your back. LIGHTWEIGHT -- Quality polyester material is endurable and light, this professional Cycle bag design is different from other backpack that is with larger figure, it is simple and super lightweight that is good for outdoor activities. SAFETY -- Designed with reflective strips on the back and the front that is conspicuous in the dark straps to keep you safe. VERSATILE -- Suitable for all kinds of outdoor activities include riding, running, hiking, mountaineering, outing, etc. Specifications: Model: Backpack / Backpack&Water Bladder (Optional) Backpack color: Black / Red / Gray / Blue (Optional) Material: Polyester Capacity: 5L Size: 39 * 17 * 1 cm / 15.3 * 6.6 *0.3 in Package Weight: 155 g / 5.4 oz Package Size: 40 * 23 * 2 cm / 15.7 * 9 * 0.7 in Package List: 1 * Cycle Backpack Note: The product includes a backpack only, other articles in the pictures are not sold. 1 * Cycle Backpack Note: The product includes a backpack only, other articles in the pictures are not sold.