Changing a vacuum bag can be a surprisingly tricky and complicated process. Vacuum bags are as varied as cellular phone chargers. It seems like every make and model is equipped with a different style and size of bag. Some newer model vacuums are bagless, but filters and other components are still utilized.
First, consult your owner’s manual for the proper bag type; if you do not have an owner’s manual, a simple internet search of your vacuum make and model will produce the needed information. The use of the wrong bag will diminish the effectiveness of your vacuum, as the proper seal between machine and bag will not be achieved. As a rule of thumb, bags should be replaced about once a month on vacuums that are used for weekly cleaning. When a bag is around 60-70% full it should be removed.
Remove your used bag by opening up your vacuum core cover and exposing the bag. Lift the bag away from the internal end of the vacuum hose (typically a flat platform with a short plastic end of the hose protruding upwards), trying not to spill any of the contents.
Installation is typically just the reverse of removal. Affix the new bag onto the internal hose-mating surface, and check for a nice tight seal. Press the bag into place, avoiding twisting, pinching or ripping the bag, and secure the core cover.
If you are looking to get a little more life out of each bag, and avoid it filling up so fast, you can place 1/3 cup of dried beans into the bag. The beans will help to mat down the accumulated dust and debris. Changing a bag is quick and easy, and can typically be done without any tools. The key step in this process is to make sure you are installing the proper bag for your vacuum. New and clean bags keep your vacuum running at peak performance.