The Qunature Multifunctional Dry Sack is a 12L waterproof bag specifically designed for cycling enthusiasts. Made from durable polyester material, this extra-large frame bag is compatible with all mountain bikes and features one spacious pocket to store all your essentials securely while out on a ride. Its waterproof construction ensures your belongings stay dry in all weather conditions, making it an ideal choice for cyclists looking for a practical and reliable storage solution on their adventures.