Carry gear in an easy-to-reach place that minimizes wind-resistance and won't get in the way of knees, feet, or other gear. Great for tools, snacks, wallet, keys and other small items. Top zipper for quick-access, Velcro strap attachments, 420D nylon. Compatible with most bikes. Medium: 12" x 13" x 8". Weight: 0.2 lbs.