To put it simply a full/queen would fit both a queen and full bed set, just like a queen/king would fit both a queen and king and so on. The real question you should be asking yourself is do you need a duvet set that will hang or do you prefer something you can tuck in to your bed set and let a bed sham instead. If you are looking for something to hang on your full bed than I would go with a full/queen duvet cover but if you want something to hang on you queen than a queen duvet cover would be the best fit they are large enough that you can let the duvet set hang off the bed. There are many different kinds of bedding that would help if you need something to just throw over your bed and hang eliminating the need for a bed skirt a queen/king bedspread is a perfect example of this, they make making your bed everyday a snap. Hopefully this helps you when determine the difference between the different sizes.
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This store allows you to purchase duvet covers,comforters,bedspreads and more all at a great price.If you are looking for a quality bed set to match your modern home decor than check out the fabolous bedding sets at Multi Shop Stop.