High-quality waterproof nylon material: The lockable helmet bag is made of high-density Oxford fabric, brushed wool lining, and equipped with a carabiner with a combination lock, 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 contents of the bag on rainy days. Large capacity helmet bag: 30L lockable helmet bag, unlike a regular small hiking backpack, which cannot hold a bicycle helmet because it is not designed to carry large items. But this helmet bag is designed for larger helmets and can accommodate full-face bicycle and motorcycle helmets. So you can take your helmet with you and don't have to worry about leaving it on the bike. Lockable helmet bag: High-quality thick combination lock directly fastens the helmet and motorcycle together, preventing loss of the helmet. 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. An excellent item for storing your helmet, wallet, phone, camera, energy drinks, cigarettes, etc. This helmet bag also has an expandable bottom section to increase storage space. Thanks to its modern design, it also looks great on your motorcycle. Wide applications: this 30L lockable helmet bag is a large motorcycle backpack, helmet bag, riding helmet backpack. Suitable for women, men, teenagers, and older children. It is a good idea as a motorcycle backpack, bicycle bag, or replacement for an emergency bag.