Thanks, it's good to know for sure, although I've always played it safe. I wonder if that has anything to do with the apparent age deterioration of these bags? I've used some to store electronics and to waterproof books stored in boxes, and I notice that after a few years they seem to get thinner, more fragile, and the surface gets sort of unpleasantly sticky/slimy.<br><br>But then, that seems to apply to the green ones as well as the black...<br><br>