The Zefal Bike Bag Convertible Backpack Yo Handlebar is a versatile accessory for cyclists. It can be used as a backpack or attached to the handlebar of the bike. The bag is designed to carry essentials such as water bottles, snacks, and personal items. It is made by Zéfal, a trusted brand in the cycling industry. The bag is suitable for various cycling activities and is a must-have for any cyclist who wants to keep their belongings safe and easily accessible.