A CHALLENGE - Stop throwing out milk bags. Stop buying freezer and sandwich bags. Reuse the milk bags and wait for the surplus to start building up.
I noticed that the actual bag that carries the milk is not recyclable in my community and I can see why. It is however an extremely useful little tool that you pay for, discard, and readily pay for a substandard substitute on a daily basis.
Manufacturers go to great lengths to provide high quality, "industrial strength" packaging to ensure their product arrives to you, the end consumer, safely. You wouldn't have it any other way and you pay for it. The problem arises when you throw this away and replace it with an expensive "consumer grade" product. The milk bag is an excellent example of this. There are many more, I'm sure.
The lowly, food grade, extremely tear resistant, stretchable, cuttable, waterproof, thick walled and well bonded milk bag. We throw this away, alot, and buy cheap sandwich and freezer bags that leak or easily burst at the seams for outrageous prices considering my opinion of product failure. The milk bag has uses beyond just a bag due to its unbelievable strength. Trust me, try to stretch it with any sort of control and you'll see what I mean. Like I said..."Industrial Strength" not wimpy little whiney, "I wish I could live up to your expectations" consumer strength.
What you need: 1 milk bag
Step 1: Wash, Rinse, Dry
Wash, rinse and dry thoroughly as you would any dish to remove any leftover milk residue.
To dry properly, the bag must be expanded to keep the sides apart and stood vertically or hung. I finally found aother use for that wire banana stand.
Note - Cutting the top of the bag open at this point will make washing and drying easier, but it will limit the uses later.