EnviroCare Replacement Vacuum Cleaner Dust Bags made to fit Filtex Central Vacuum 12 gallon 4 pack

I have seen some folks complaining here on the bag size. The 12 gallon are the larger size size and the 9 gallon the smaller size. Here are the Filtex provided measurements (I have found them to be approximate):9 Gallon13.5 inch diameter (same as 12 gallon)12 inch depth (more like 16 inches)12 Gallon13.6 inch diameter (same as 9 gallon)24 inch depth (seems pretty close)The bags work interchangeably (well sorta). The 12 gallon is folded at the bottom to fit in the 9 gallon vacuum can. This is fine since the bottom fills with dirt and the suction is around the sides of the bag anyways. The 9 gallon just hangs in the 12 gallon can. In most cases this works fine unless you vacuum up lots of heavy stuff such as garage dirt and rocks. In this case you risk the bottom of the bag blowing out and getting your secondary filter bag all nasty and the motor filled will dirt and dust.Over all these have work great for me in my 9 gallon Filtex vac. These particular bags also are the cheapest option for the Filtex vacuums that I have found.