Reusing Ziploc bags is safe as long as you wash the Ziploc bags out after use.
You can wash the Ziploc bags out in the sink with some dish soap and then rinse them out and reuse the Ziploc bags until they start falling apart.
I reuse Ziploc bags a lot and it saves me money and it's pretty simple to just wash them out and rinse them for reuse.
It's also a good way to recycle Ziploc bags and it saves room in the landfill.
You can usually reuse Ziploc bags for at least 10 to 20 times before they fall apart and need to be thrown out.
The best way to actually recycle something is to reuse it as many times as possible and by reusing the Ziploc bags over and over again you're saving resources and recycling the bags in a better way.