Product review (4 stars): Not perfect but I just reordered.
40 bags lasted us January until mid-August. I think that works out to slightly more than one bag per week. Prior to finding these, I used paper compactor bags we got from Walmart. The paper bags are much more expensive than these, plus I have to go to WM to get those, yuck.  We have a KitchenAid compactor and these work pretty well in it.  You sort of get the knack of how to make them work.