If you want to go green and be safe, make your own tote bags re-purposing items found around the house or buy your own (made in the USA) fabric.
Martha Stewart always has great ideas, below are some links to instructions and patterns for tote bags on her site. I could only post a few because of the URL restrictions, scroll through and you will see some great ideas.
If you purchase bags, I would suggest only buying plain bags that are Made in the USA. I won't buy those store brand tote bags. I would never pay to be a walking advertisement for any business, especially when there are so many other options.
Mesh Bag Denim Tote - made from old jeans Tote made from pillow case T-shirt Tote