Volumes.
If you put equivalent volumes in a bag, where both weigh the same, the density might get equal.
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It is called the Rugae.
Rugae is a term used in anatomy to refer to a series of ridges produced by folding of the wall of an organ. For example the gastric rugae which allows for expansion of the stomach after the consumption of foods and drinks. The rugae of the vagina are the transverse ridges on the mucous membrane lining the vagina. They allow the vagina to stretch during childbirth.
Skin is the Largest barrier agaisnt Pathogens which include Bacteria which cause infections.
