Many of us are in the habit of using reusable bags when we go grocery shopping. One way to help us remember to use them is to leave them in the trunk of the car. But as useful as that is in reminding us, it can actually hurt our health in the long run. The environment of a trunk can be the perfect breeding ground for bacteria to grow in your bags. Use them to hold fresh fruits, vegetables, meat and other food products, and you risk cross-contaminating your groceries. Instead, keep your bags in a cool, dry environment inside your home, and wash and dry them frequently to keep them clean and sterile.