Well these bags really fit, albeit a bit tight. The 'problem' is that since they aren't designed exactly like the factory Roomba bags, they can't always flip the switch and 'click' when you insert the bag. You need to make sure the 'tab' you use when lifting the bag actually pushes into a small pocket in the bin where the switch will tell it there is a bag there. If you don't, that little tab will miss the switch and not register the bag there. Hope this helps someone as it is a great product.
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