High-quality waterproof nylon material: The lockable helmet bag is made of high-density Oxford fabric with a brushed wool lining and features a combination carabiner; it is waterproof, lightweight, tear-resistant, easy to scrub, and durable. High-quality hardware, neat stitching, and a stylish design make this bag a perfect motorcycle bag. The helmet backpack with waterproof material can be used anytime, anywhere to protect the bag's contents on rainy days. Large capacity helmet bag: The 30L lockable helmet bag differs from a regular small hiking backpack, which cannot accommodate a bicycle helmet because it is not designed to carry large items. However, this helmet bag is designed for larger helmets and can accommodate full-face bicycle and motorcycle helmets. This allows you to take your helmet with you without worrying about leaving it on the bike. Lockable helmet bag: The high-quality thick combination lock directly locks the helmet and motorcycle together, preventing the helmet from being lost. The handle design allows you to hang or carry the helmet on the motorcycle. Practical and versatile: a classic look and all the features you can imagine. A great item for storing a helmet, wallet, phone, camera, energy drinks, cigarettes, etc. The bicycle helmet bag also has an expandable bottom section to increase storage space. Thanks to its modern design, it is also an ornament for your motorcycle. Wide applications: this 30L lockable large helmet bag is a great motorcycle backpack, helmet bag, riding helmet backpack. Suitable for women, men, teenagers, and older children. A good idea as a motorcycle backpack, a bicycle bag, or a replacement for an emergency bag.