Large 16 inch x 20 inch replacement bag with pull and lock cords to keep them securely fastened to your leaf vacuum. Universal-sized mesh bags that fit most types and brands of pool leaf vacuums and some leaf vacuum jets. These are the standard-size fine mesh filter bags that are used with the U.S. Pool Supply Leaf Terminator Vacuum. These fine mesh bags are made of finely stitched durable nylon fabric netting material so they can catch and hold the smallest leaf particles and other debris. Using a leaf vacuum pool cleaner with mesh filter bags regularly will help prevent the clogging of pool pumps, skimmer baskets, and other filters, so your pool filtering system will need less servicing.