Is it because it's stuff or because it's old?
In our family we don't mind giving/receiving things as gifts that aren't new. I'm very thankful because my budget is so tight that it says, "Ouch!" when I look at it. Books, clothing, toys, many other second-hand things are considered fine gifts within the family - and sometimes the bargain is part of the gift.
On the other hand, maybe your vent is about stuff that is just stuff. This is what I suspect, because if there were a book you always wanted and somebody found a copy at the Goodwill store, you wouldn't complain, right? Or that fancy-name sweater that some lady shelled out big bucks for and then decided it didn't look good enough on her?
My mother (who would be 108 now if she were still living) could not throw stuff away. She wasn't a hoarder - she wouldn't have qualified to be on the show - but she did accumulate things. She'd resolve courageously to cut down on the, um, inventory in her apartment. But she just couldn't manage to "throw good things away." She also had a hard time giving them away to charity - not because of the charity or the getting-rid-of, but because in her later years she couldn't haul things downstairs and outside to the curb.
Her solution? She mailed them all to me!
Yes, it's crazy. If it crosses your mind to imagine how much she must have paid for shipping, you may laugh. But she was willing to do it. She would send me all those things, knowing that I would go through the boxes, keep what was useful for my family, and give the rest away to... charity.
(She used to pack things in liquor boxes the booze store had discarded, because those boxes were big enough to hold a lot but not too big to become impossibly heavy. The UPS delivery man and I recognized each other by sight in those days. Once he came to the house with six boxes and said, "I'm getting worried about how much your mother must be drinking.")
It worked for my mama. She didn't have to do the giving away! And I didn't mind. It was a way of helping her.
If it's possible, can you change the attitude from, "Ugh! All this junk..." to, "Come on, kids - we've got more boxes and we can have a treasure hunt!"?
Or maybe this comment will just make you laugh hysterically, and a laugh can be good for anybody....