With this version of the Kärcher WD 3 P V-17/4/20 EU III, you get 4 extra vacuum cleaner bags. So you have a stock right away, and you're not without vacuum cleaner bags. The WD 3 P V-17/4/20 is a bit more extensive than the standard WD 3. The biggest advantage is that this version has a built-in socket. So you can connect your power tools to the vacuum. That's useful, because you can vacuum dust particles that were released during your work. The vacuum has a 17L dust and liquid reservoir, so it's suitable for average jobs in and around the house. After use, you can clean the filter underneath the faucet. A clean filter ensures the best suction power.