Are Ziploc bags sanitized?

According to a Ziploc representative, the Ziploc Storage, Freezer, Snack and Sandwich Bags are reusable by hand washing and thoroughly drying prior to reuse.

How do you sterilize Ziploc bags?

For the reusable plastic bags, wipe them down with a disinfecting wipe or wash them in warm soapy water. You’ll want to do this preferably after each use, and especially when bringing meat home,” says Mujahid. Finally, make sure to air-dry reusable plastic bags before using them again.