I just looked at my current supply of trash bags, Kirkland brand from Costco. There is a warning on the box stating "CAUTION..."Not recommended for food storage." No explanation as to why, my guess is just because they are reportedly made from recycled products. I do know that there is "food grade" plastic and the other stuff... <br><br>I suspect that you could use one for short term food/water storage in an emergency, but only in a real emergency, and only for real short term...