While this in itself would be a good enough reason to purchase a ton of them and fill your house with them instead of regular furniture, I'll give you some other ideas as well. Well, if you've got some bags lying around, all you have to do is rozalie them into the party room and viola. They are a more creative and comfortable way to lounge around than most types of seating. This means they are really flexible in where you can put them. Bean bags are probably my favorite kind of furniture there is.

Bean bags are really light, because they are filled with nothing but light foam pellets.

If you have big ones, they can be used as couches, sofas, and even begs. Bean bags also make good replacements for other kinds of furniture. Say you are having a party but you don't have enough seating for all your guests. They can go with you on picnics and tailgating parties as well, so they are pretty awesome in a lot of ways.

Thus, they are really portable (depending on the size...some of the newer ones can get really huge and are a result do not make the most portable of objects).