High-quality Material: Water-resistant, lightweight, and durable 300D Polyester fabric. Enough Capacity (0.8L/0.21Gal): Ideal to store small items such as flashlights, knives, keys, smartphones, etc. Hook And Loop Fasteners: Easy to install and take off; suitable for all types of bike saddles. Inner Mesh Pocket: Perfect organization for small items and gadgets. Reflective Taillight Hanger: Alert others of your presence at night; an optional taillight can be attached.