The bags are indeed from the safe paper superior non-woven material, and purely for the price the bag compared each are also relatively inexpensive, but they are for the container of my WD 7,700 P much too small - they only take about 1/3 the container volume a! Apparently Kärcher compels the customers here, according to buy more bags of what a still more costly than many other manufacturers causes, their bags are indeed about 50-100% more expensive, but also have ~ 200-300% more volume. In addition, the bags have no closure, ie when removing and discard bag full of dust it out of the opening. Bags of other manufacturers have a slide with pull tab, so that the bag can be closed before removal; or at least one cap, with which you can close the bag after removing them.
100% suitable alternative bag Unfortunately I could not find, but you can also make other bag fits and benefits with some modification / improvisation.
