MagiDeal Mountain Road Cycling Bicycle Saddle Bag Rear Tail Seat Storage Pouch Material: Polyester Size (L x W x H): approx 7 x 7.5 x 15cm / 2.75 x 2.95 x 5.91 inch Made of tear resistant polyester, durable and long lasting Can store some small stuff like key, small purse, small cell phone etc The tail light can be placed in the rear bag, offer you a double protection