Outdoor Bike Cycling Tail Clip-On Quick-Release Reflective Seat Nylon Bag Bicycle Saddle Seat Rear Bag Expandable Storage Pouch - Blue Made of high density 600D fabric, with reflective strips Scalable design, the middle seat zipper pull can increase the volume of the package Quick release type, with a quick release mounting bracket and installation tool Great for keeping your tools, wallet, keys and other small items Bike light can be hung on the bag tail;Dimension(cm): 16 (L) x 10 (W) x 10 (H);Extended dimension(cm): 16 (L) x 10 (W) x 15 (H);Weight(kg): 0.16