Sleeping bags are very useful to have in the home. They are good for those who often go camping, but it is also good to store at home for a number of reasons. If you have school age kids, sometimes they would need to stay overnight in school and they do not have beddings. Then you can just let them bring sleeping bags with them. They are small, lightweight, and not too much to pack, so they are very convenient.
If you have guests in the house and there is not much space in the guestroom, some of your guests can just spread the sleeping bags in the living room and that would be instant accommodate. These are better than having mattresses because these need a lot of space for storage and you would need to have blankets and sheets for them. But as for sleeping bag, it is the only thing that you need to store and maintain. So take care of your sleeping bags by cleaning them after every use and wrapping them in plastic before storing them inside the cabinet. This will make the sleeping bags last a long time as they are protected from insects and other factors that can damage them.