Royal Hand Vacs
IMHO.....the Royal hand vacs and even the Red Dirt Devil hand vacs like the model 103 are fantastic and well made. Though they can appear to be cheaply made perhaps because of their red color, I have found them to be fairly sturdy. And, these little devils (pardon the pun) will surprise you as to what they actually pick up considering they only have a 2.0 amp motor, I believe.
They are great for Mattresses, sofas, car interiors, stairs particularly, and wherever you need "the power of an upright in the palm of your hand" as their tag line went in the 90s. I have many of these as well and they are keepers!
I did a little experiment a while back where I used this little machine to clean a major walkway in my house for several days in a row and surprisingly it picked up a lot of dirt! The paper bag option is the way to go and in my opinion, because these are not high amp machines, the rather cheap quality paper filter bags work well since the there isn't a lot of air pressure generated to force the dirt out through the paper bag. You must however, be conscious that you are using a machine with an inflatable bag that is capable of bursting if you are rough with it. If you are careful and don't use these vacuums like a half track you will be fine and the machine will treat you well, too!