A 2012 study by the Center for Health, Environment and Justice found that 75 percent of children's school supplies (folders, backpacks and lunchboxes) contained toxic phthalates. If you're a parent trying to avoid pthalates, there are certain steps you can take to find nontoxic school supplies. First, look for canvas, hemp or cotton backpacks; avoid shiny, plastic-looking bags that are likely made with PVC. The same goes for lunch containers: Stainless steel containers or fabric lunch sacks are better than hard plastic boxes. And go with rigid paperboard binders over plastic ones.