I saw this at my local Your Independent Grocers in Alexandria, Ontario last week.
For those of you who don't live in Canada, we can buy our milk in plastic jugs (rarely), cartons or in plastic bags. You get 4 litres in 3 tube-like clear bags which come in a larger plastic bag.
The larger bags are the bags that this group is looking for. Apparently, they cut the bags into strips and crochet them into mats to be sent to folks in Haiti as sleeping mats.
We squished the sample they had hanging and it was fairly springy and would be comfortable to sleep on. What a great idea!