1Multifunctional Design: 3 in 1 multifunctional bike trunk bag, which can be used as a pack bag, shelf bag, or rain cover to meet the different needs of outdoor cycling. 260L Large Capacity: The bike rear seat bag has 60L large capacity, which can accommodate enough items and facilitate carrying the necessary equipment for cycling. 3Rainproof Cover: This bike bag has rain cover design, which can effectively protect the items inside the bag from moisture or rain, without worrying about bad weather. 4For Mountain Bike: This multifunctional bag is designed specifically for mountain bikes and can be securely fixed to the shelf or frame, providing stable storage space. 5Polyester Fabric: This bike bag is made of excellent polyester material, with wear resistance, scratch resistance, and a long service life, suitable for long term outdoor use. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.