IMPORTANT PRODUCT IMFORMATIONS: The sunhiker backpack is a small-sized backpack with dimensions of 15.8H x 9.4L x 5.9W inches/40 x 24 x 15 cm, a weight of 12.3 oz, and a capacity of approximately 20-25L. It is suitable for both men and women who prefer a smaller sized backpack and only want to carry essential items while traveling light. This size is also suitable for children above aged 3. Please make sure that it is the size what you need/want before purchasing. ABOUT THE MATERIAL: This hiking backpack is made of Nylon Fabric, which has the following features. 1) Good waterproof performance: After being treated with a waterproof coating, the backpack has a good waterproof effect; 2) Good abrasion resistance: nylon is relatively durable and can withstand wear and tear better than other fabrics of similar products, making it very durable; 3) Good breathability; 4) Lightweight ;5) Easy to clean. DETAILS DETERMINDED QUALITY: We pay attention to every detail for the small backpack: 1) High-quality smooth zipper; 2) Back and shoulder strap design with breathable mesh pad to help reduce the pressure and fatigue caused by prolonged use; 3) Adjustable chest and waist straps for convenience.