The first thing to know when using these bags is that it must be used in addition to the filter on the vacuum cleaner. And this for two reasons: the first is that the filter edges rubber prevents the bag from tearing and the second is that even if the bag was torn, the filter in place will avoid waste going to block the turbine vacuum whose destruction would not be taken into account by the warranty. Of course, the fact of maintaining the filter in place reduces slightly the useful volume of the bag (20 liters in a WD 5600 MP) but it is an obligation.
Bag 3-layer structure including 1 paper layer is very effective. For my part, I have never had a bag with holes and when you used the vacuum cleaner to pick up cement dust while you're grinding a concrete slab; on the one hand, you're happy not breathe the dust and when you remove the full bag, you find that it is very heavy.
Using a bag is recommended for all toxic dust: cement, sawdust treated, etc. As for all fine dust (plaster, coatings) that are abrasive and harmful to all craft supplies.
