Material: high quality light-weight and waterproof material, nylon lining, environmentally friendly fabric, no discoloration, no odor,Adorable color,stylish design, pattern print. Perfect design: This backpack has one main bag and one sub bag ,two Mesh Pockets on The Sides, with high-quality zippers, three-dimensional shape, ergonomic shoulder strap S-shaped sponge strap, lined with high elastic sponge, reducing shoulder pressure, breathable and sweat wicking, lightweight and comfortable.The shoulder strap has reflective strips.