This is one of the funniest things when introducing people to some of the ingredients and methods used in commercial food production -- stuff like Xanthan gum as a thickener, soy lechtin as an emulsifier, or calcium propanate as a preservative. Once people know what they do and how it works they stop being "scary chemicals" corporations are putting in our food. I think it's a branding issue, sodium bicarbonate is a scary chemical but baking soda is a household ingredient, MSG is super scary but seaweed salt sounds delicious.
I tend to bake two loaves (always with tangzhong if the particular recipe can tolerate it), wrap both, immediately freeze one, and the other one lasts somewhere short of a week.
If you keep it airtight, the crust will dampen from the moisture that comes from the inside.
Which storing bread that has a crust worth preserving, I tend to make sure it gets a little air (covering it with linen cloths, for example), and accept the small amount of drying out that comes with this form of storage.