This features -grade durability which will keep the content of your backpack safe. The reflective tags and strips on the backpack to keep drivers alert in the morning or at night. This is no doubt the best for running, hiking, cycling, or biking. Feature - Color: Blue. - Material: Nylon. - Size: 41.00X32.00X2.00cm/16.11X12.58X0.79in - The package does not include water bag. - Lightweight, and waterproof: Super lightweight nylon material makes the pack never weigh you down in outdoors. - Waterproof and design make durable and keep the essentials of your pack safe. - Its ergonomic mesh back allows for steady airflow to keep you from overheating, and comfortable while riding or hiking. - Large capacity and storage: Perfectly fit your essentials and free your hands to explore. - Adjustable shoulder and chest straps: Fully adjustable shoulder and chest straps make the hydration backpack stay in place while running and allow for the for any body type. Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 1 Backpack