I think you have a “sheet sleeping bag”. This used to be standard in european Youth Hostels, though I’m not sure they still use them. Basically it separates your body from the rest of the bedding, so that only the sleeping bag needs to be washed regularly. It’s you that goes in the bag, not any other piece of bedding :-).
The lack of blankets in the cupboard is probably by accident rather than design.
What you probably have is a duvet cover used as described in your fifth paragraph.
Essentially you put blanket(s) in it with the idea that the cover is easier to wash than the blankets.
Based on my basic knowledge of Mongolian history I would think that this was imported from Europe (Russia).
This makes me wonder how often the blankets are washed…especially in freezing, winter Mongolia.
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