The bread will absorb the moisture from the celery and will then prevent the bread from drying out faster.
Place the wrapped veggies in a container, and then place it inside the refrigerator.
This bag will help keep the moisture in your veggies preventing them from wilting.
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Cookies
Place a slice of bread in your cookie jar before storing them.
The breads moisture will help keep the cookies soft once absorbed and prevent them from drying out.
However, putting too much bread inside will make them mushy.
Salt is a preservative that would keep bacteria from spreading, thus, keeping your milk fresh and yummy.
This vacuum sealing method will force all of the oxygen out and will help preserve food.