Large capacity: main compartment 13L + subsidiary subject 1L + 2x 0.3L minor = 18L cycling backpack (rain cover included, key pocket, detachable bag and mesh pocket for the helmet) is suitable for outdoor activities such as biking, camping, mountain climbing and hiking, etc. , Breathability and comfort: Adjustable shoulder and waist fit each client perfectly. Breathable back and hip were extra padded with mesh material for optimum comfort. The hip belt is designed to facilitate loading and quiet and safe ensure cycling. , Ideal hydration system: On the shoulder a hidden H2O output for Trinkschblase is equipped. You can always even if drinking while driving water. Waterproof and langlebendigem Polyester this backpack has a long service life. , Credible security guarantee: The reflective stripes on the shoulder strap is used to ensure quiet and safe cycling in the night. ultra light and durable. , Customer Service: 100% satisfaction guarantee. Any question about our product or our service, please feel free to contact support@lixada.com. We will reply within 24 hours and do our best to make you happy.