The jars too are obviously different between the LINER version, where the PC reusable jar has the function to support the disposable bag, and the CANISTER version, where the jar, when fastened with the lid, becomes a complete sealed container to be disposed after the use. In both versions a graduated scale printed outside the jar allows an easy monitoring of the volume of the suctioned fluid. The jars, both in LINER and CANISTER versions, have a conical shape to get small size packaging, to save transport costs and space during the storage. To avoid jars getting stuck or unexpected inner scraping, four ribs inside the bottom area stop properly the jar position when one inside the other.