Roswheel Bike Bicycle Triangle Bag Saddle Cycling Frame Seat Pack Colorful Bicycle Triangle Bag Fabric: 600D & PVC Size: L27*H12*D6cm Weight: 110g There are 3 quadrate fasteners on the top and bottom of this bag. There are 218*3cm magical labels on the top and one at the bottom of the bag, so it is easily to fix on your bike.