Wave Series: The 185 Wave Filter 185 is a zipper type that is convenient for storing and storage. The Wave Series is an original Kalita product series that allows everyone to easily enjoy the best taste, from beginners to professional baristas to anyone who can easily enjoy the best taste, and the Wave Filter 185 (155) is less contact with the dripper so you can pour hot water. But the wave zone is at the bottom. Because it is flat, it is easy to use for 2 to 4 persons (estimate) filter is easy to take out the whole bag and store the bag in a package; Caution: The coffee filter paper should be folded into the side and bottom zipper closure of the bag. Otherwise, it may peel off during extraction. In addition, if you pick up the filter paper after extraction, the bottom may come out.