Product information: Lining texture: Polyester Applicable scenario: outdoor sports Color: red, purple, green, black, dark blue, gray, light blue, orange Applicable gender: neutral/both men and women Function: breathable, waterproof, wear-resistant, anti-theft, anti-seismic, burden reduction Material: Nylon Size: 18 inches Bearing system: airpillow straps Popular elements: sewing line Style: cross-border Fashion Capacity: 56-75L