The Seachem Medium Zip Bag is a practical and versatile tool designed for aquarium enthusiasts to safely and efficiently contain media within their filtration systems. Made from durable, fine mesh material, it allows for optimal water flow while preventing smaller media particles from dispersing into the aquarium. This reusable zip bag is ideal for holding various types of filter media, such as activated carbon or biological media, making it an essential accessory for maintaining a clean and healthy aquatic environment.