The use of film for snack food packaging offers a number of advantages, including:

1. Protection: The film provides a barrier to external factors such as moisture, oxygen, light, and heat that can spoil the quality and freshness of the snack food. This ensures that the snack food remains fresh and appealing for a longer period of time.

2. Safety: Film used for snack food packaging is designed to be safe for food contact, so it does not contain harmful chemicals that can migrate into the food.
   

3. Convenience: Snack food packaging film is lightweight and easy to handle, making it convenient for consumers to carry and store. It also allows for easy opening and resealing of the packaging, which helps to maintain the freshness of the snack food.

4. Cost-effective: Film packaging is a cost-effective solution for snack food manufacturers due to its low cost and high efficiency in the packaging process.

5. Versatile: The film can be customized to meet the specific requirements of the snack food, such as different sizes and shapes, as well as different printing and branding options to enhance the visibility and appeal of the product.

6. Eco-friendliness: Film packaging can be made from eco-friendly materials that are biodegradable or recyclable, helping to reduce the environmental impact of the snack food packaging.

Overall, the advantages of film used for snack food packaging make it a popular choice for snack food manufacturers, as it offers protection, safety, convenience, cost-effectiveness, versatility, and eco-friendliness.