I use doo-hickey because I do not want to dignify the IG4 by using more couth appellations. It is simply a mock up with a bunch of splendid lies told about its supposed uses.
I use drip bag because that is what it is. Uncouth or not, nobody has to look up drip bag. They instantly know what it is. They have all seen one or more in use.
I am fortunate enough to have never needed one. But I have seen them. Lots of times.