A snowmobile tunnel pack is a storage accessory that is mounted on the tunnel (the structural frame that connects the front and rear skis of a snowmobile) of a snowmobile. It is typically made of durable materials such as nylon or canvas and is designed to provide additional storage space for gear and other items.

Snowmobile tunnel packs are typically available in different sizes and styles to suit different snowmobile models and preferences. They may have features such as padded shoulder straps, multiple compartments, or water-resistant materials to help protect the stored items from the elements.

Snowmobile tunnel packs are typically designed to be easy to install and to remove, with mounting hardware and straps that can be easily adjusted or removed as needed. To ensure the best performance and longevity of a snowmobile tunnel pack, it is important to follow the manufacturer's recommendations for installation and maintenance and to use the pack in accordance with the manufacturer's guidelines. It is also important to regularly inspect the pack for signs of wear or damage and to replace it if necessary.