These are good bags and a cheap alternative to the Sears 5055 which unfortunately are insanely expensive by comparison! to sort of a square bag configuration, it's more of a "boat tail" configuration as the bottom/back of the bag is lined rather than flat. Think like the bottom of a bag of potato chips. So I suspect this probably results in the bag not being as roomy as the original 5055, but I doubt anyone would wait until the bag was full because at that point you just turn your engine off! So at this price you don't feel so bad about throwing away a partially filled bag. Also, you know the engine is tiring, even though your vacuum cleaner bag and usually the air that goes in there isn't that nice anyway. So grab these bags and enjoy the opportunity to get a new one cheap!