Typically bed in a bag sets contain the sheet set, the comforter and duvet cover. The number of pieces included depends upon the size of the bed in a bag sets that you need. It can also depend upon where your purchase is made. There are variations of the sets that may include certain items when purchased at one place that may not be in the set when purchased elsewhere.
Many Americans prefer just the comforter, although a duvet is generally thicker and warmer. With either, you need lots of width and length to cover the mattress and then lots more! Note that the comforter should be a good two feet or more greater in width than the mattress and 8-12 inches longer. A duvet is often shorter and less wide than a comforter, but still larger than the mattress.
When purchasing twin bedding sets usually the set will include one twin sheet set, one twin bed skirt, one twin comforter and one pillow sham. Sometimes it will include a duvet cover and bed skirt and sometimes it will not. This is why it is very important to read what is included in the set.
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