Why should you keep bread airtight?

you should keep bread airtight because the more air that isn't circulating through that particular loaft of bread the softer the bread will stay and the fresher the bread will be.

you wouldn't have crustied up bread if you keep it airtight. air is of cours, going to insert itself inside the loaft of bread when you open up the loaft to grap you a piece. After you have grabbed you a piece of bread make sure you push as much air out of the bread bag as you can and it will prevent the bread for being less fresh.