Logan and Lenora bags are made with a waterproof lining made with a medical grade barrier fabric that stands up to heavy duty use and frequent laundering. Logan and Lenora bags are also safe, meeting CPSIA standards and free of BPA, phthalate, cadmium, and lead. Logan and Lenora bags are food safe. The lining is heat bonded (without chemicals), fusing the layers together to create a strong waterproof seal. The bag is then finished with a durable water-resistant YKK zipper.