I kept reading about sleeping bags on different sites and came across two ideas:
1. A sleeping bag should be 20-30 cm longer than the user's height.
2. It is not good for the bag to be longer than the user's height because it creates air gaps that are harder to heat, so you may be cold. It must be as tight as possible on the body.
From your experience, which idea is correct?
What would be a good ratio between the person’s height and the length of the bag?
What would be the advantages and disadvantages of a bag a few tens of centimeters longer than the height of the user compared to one of only a few centimeters?