Mugs are difficult, as they tend to be little presents for particular occasions. I have a couple of Mother's Day ones from when the children were small, and Best Teacher ones from students. I don't use any of them, as I prefer white china and these are all colourful pottery, but I'm hopeless at throwing things away, worse at throwing presents away, and dreadful when they have some sort of sentimental value.
I have people over later, so I don't know that I'll get much decluttering done today, but I will try to fill some bags if I can. I have 6 to go to the charity collection mentioned upthread, but as the next one won't be for a month I wanted a lot more than that to go, so there won't be bags lying about for ages. They are coming on Wednesday, so I need to put them out on Tuesday night, according to the website.