Northwest Haiti Christian Mission Canada has a Mats 4 Haiti Program that distributes milk bag sleeping mats and totes for people in Haiti. I first heard about it when I was talking with some women at a local coffee group. They had an overabundance of milk bag yarn made and ready to be used, but not enough people to make the mats. Since I knew how to crochet I volunteered to try making a mat if they would drop off a load of the yarn at my house.
This instructable will tell you more about why the milk bag mats are useful, how to make your own milk bag yarn, and how to make a milk bag mat.
Northwest Haiti Christian Mission Canada is a registered Canadian charity (#86060 0345 RR0001)
Mats 4 Haiti Program: http://www.nwhcm.ca/mats4haiti.htm