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 offβ¦