…and reusable shopping bags, generally. These are supposedly better for our environment than nominally single-use plastic or paper bags (though both, until they wear out, can serve other purposes than holding food or other goods—usually two or three reuses until they’re truly ready for the trash or the recycling bin).
The serious questions, though, and ones that have been missed until the current COVID-19 situation has exposed them empirically, are:
For whose environment, exactly, are reusable shopping bags better?
Who, exactly, are the ones doing the reusing?
The answer to the first is…germs.