Bread should be stored at room temperature in a closed bin or in a bread drawer with holes. Do not store your bread in the fridge.
The bread bag which your baker uses is not just a paper bag, it is a paraffin bread bag. It has been designed to prevent your bread from drying out. Your bread can also breathe in this bag.
You can easily freeze bread. Take a fresh bread, place it in a deepfreeze bag or leave it in the paraffin bread bag and freeze it.
An ideal solution for lunch is to freeze smaller portions. Remove the package from your fridge the evening before and let it thaw at room temperature.
Dip old bread in egg and milk, fry it in a pan, sprinkle with sugar. Delicious!
NOTE: Thawed out bread should not be refrozen!