OK...guess I have to plead ignorance on the slow-cooker liners. Never ever heard of these until this topic and discussion. Does anyone know if cooking food in plastic is safe, for sure? Petroleum products combined with food just leave me wondering about safety. Has anyone read anything verifying no plastic "leaks" into the food...at cooking temps sustained all day or all night? I sounds like it would be a -wonderful- tool, IF it's 100% safe. Lost family members to cancer, etc. so am maybe am being too cautious. ANYWAY, has anyone read any studies on this topic?