Here is a report from the Center for Consumer Freedom giving the lead and cadmium content of various reusable bags (pdf format):
http://www.consumerfreedom.com/downl...bag_report.pdf
I was going to use some Ikea bags next year so good to know they are low in lead. Another good idea, if you have any leftover landscaping fabric you can sew or staple it into a pot shape for an even cheaper (ie free) grow bag.