Zipper strategically placed on the bottom for durability and ease of use. Easy to attach to the blower and an adjustable shoulder strap for comfort. Simply fill the bag, unzip the bottom and empty into a container. Dimensions - width: 22 inches, length: 30 inches. 1.5 bushel capacity. Made from durable canvas material. Attaches to the original bag's plastic, vacuum collar. Fits models 51539, 51549, 51553, 51573, 51574, 51587, 51591, 51592, 51598, 51599, 51602, 51609, 51617, 51618, 51619 and 51621.