Uses for Old Plastic Bags
First off, let’s examine how a plastic bag becomes classified as food safe
It is the responsibility of the manufacturer of any Food Contact Substance (FCS) to ensure that food contact materials comply with the specifications and limitations in all applicable authorizations. .
Testing recommendations are set up by the FDA for all manufacturers of FCS materials to follow .
All Ziploc® brand Containers and microwavable Ziploc® brand bags meet the safety requirements of the U.S. Food and Drug Administration (FDA) for temperatures associated with defrosting and reheating food in microwave ovens, as well as room, refrigerator and freezer temperatures. 
Next, let’s examine what NOT to do with food safe plastic bags.
If washing is desired, they could be turned inside out and then put inside one of those mesh bags made for washing delicate clothing. Then throw the mesh bag into the washing machine on the cold or warm wash cycle, but not hot. Wash the bag along with other things so that you’re not wasting water on just recycling plastic.
If this is the case then either check the next section for a quick nonfood use of the bag, or trash the bag.
If there is nothing deemed beneficial for your needs on the following list, then at least store them up for recycling day.
Uses of Plastic Bags
Ways to Use Old Baggies For Protection, Clean-up and More
Using a phone or tablet to follow a new recipe can be handy, but often quite messy. Slip the device into a plastic bag before using – it still works thru the plastic!
Recycled bags can fit like a glove! Use it to knead dough – no messy hands while working and then no clean-up as you toss them afterwards.
Use one to pick up raw chicken or pork and then toss it out afterward.
Of course, pipe frosting if you have no pastry bag. Just cut a small hole in the corner of the bag first. Do be careful not to squeeze too hard tho, thin baggies can pop very easily and leave a huge mess in your hands. For this use, it is best to begin with a new bag to be sure it is clean.
Put some in your diaper bag & any place you visit will appreciate that you placed a loaded disposable diaper there before placing it into their trash can.
The bigger bags can pick up dog poop for big dogs. The zip seal is a big plus, no trying to turn a little bag inside out to tie it up.
They can hold an oil filter for later recycling at a garage.
Fill the bag with white vinegar and then place securely with a rubber band over a shower head that is in need of cleaning due to hard water build-up. Leave it on for an hour or so and then scrub with an old toothbrush and rinse afterward. The vinegar soak will descale the mineral deposits left behind by hard water.
If there is an interruption while painting, then just stick the paint brush inside a plastic bag and seal it. The paint will stay moist for at least the time it takes to answer a phone call. To keep it fresh as long as overnight, slip the bag covered brush into the freezer and then thaw it out in the morning before beginning again.
One doesn’t really need a new bag just to hold ice.
Fill a bag with fragrant dried flowers and/or herbs. Poke holes with a pin into the bag afterward to emit a nice, constant fragrance. Be sure the bag was clean and dry or mold could begin to form in the bag.
The best way to avoid sending plastic bags to the dump, or even the recycling plant, is to not use them at all!
These two websites, chicobag.com and envirosax.com, both sell some very cool environmentally friendly bags that put plastic to shame.