It will come as no surprise to anyone who does the grocery shop to learn that new research has raised hygiene concerns over our old friend the Bag For Life. Apparently in bacterial terms this should have a very short life. Especially if you put raw meat therein. Attempting to wash the thing only makes matters worse. So. On one hand we're told to avoid single use bags, on the other, that reuseable bags are dodgy. Meanwhile one agency urges us to eat all food before its use-by date while the say-no-to-waste lobby argues open it, smell it, take a chance. Clashing official advice. It's all very confusing.