I have used mine for sanding table tops and similar applications. the bag did fall off. I used some lock-tite thread adhesive, the bag does not fall off now. The bag also has a twist locking mechanism which works fine, so I never need to seperate the lock-tite bond unless I need to open the sander up for repair. That is perhaps the difference between 4.5 stars and 5 stars. Still I think it is better than a 4 star sander.