The Fluval A1428 is the correct filter bag for the following:
The Fluval A1428 Universal Aquarium Media Filter Bag is a universal filter media bag for all Fluval canister filters. This Fluval media filter bag firmly holds media, with included plastic fasteners, to properly maintain a clean aquarium. This aquarium filter bag is designed for use in both fresh and saltwater aquariums.
Fluval A1428 Universal Aquarium Media Filter Bag specifications: