I have several old duvets, all of which need a wash.
Once I reach the point of wanting to wash a duvet, I look at the laundrettes/dry cleaners, see that it's £10+ to wash a duvet, and go to Tesco for a new one for a similar price 
It feels wasteful to chuck the old duvet, so it gets added to the pile ... I have four now.
What can I do with them? They don't fit in my 6kg drum washing machine, otherwise I'd wash them. My DM has a 9kg drum, but I don't want to risk breaking her machine. If I wash them by hand in the bath, will try ever dry without a spin? Or can I put them in the clothes recycling bin in the Tesco car park? I can't bring myself to landfill them ...
Any advice?