Question about the clear "window" in the bag:
Was this feature actually useful? I have never seen it in real-life, but I would assume that after a while, the dust in the bag would just cloud up the window, and the user would not be able to see anything anyhow. Also, if the window is at the top of the bag, how could anyone know how much room was left in the bag until the mountain of dirt actually reached the top? Seems like a great idea in theory, but not in practice......