Reusable bags are great for the environment. Reducing plastics and can be reuse over and over again. How many time do we reuse a bag before we finally wash it?
These bags are probably reused 10 to 100 times before we finally thought it is dirty enough to go to the washing bins. The fact is look clean doesn't mean that it cannot pick up bacteria from the item we placed in and from the environment.
I also tends to separate bags for different item. The more sensitive fresh items such as vegetable and fish versus can food for example. Just remember as you care for your environment, do care about food safety as well.