Retort bags are for high heat pressure canners. The bag is a 7 mil metalized bag designed for high heat pressure canning of all types of foods including meats and fish. The bags are BPA free and FDA approved for use in canning shelf stable food products for resale or home use. In retail applications consult your health department about canning using Autoclaves. For home canning use a standard pressure canner with a pressure gauge following canning guidelines for preserving foods. A chamber vacuum sealer is required for proper sealing. We suggest the Sammic or Minipack lines, both have proven to be quality units able to easily seal retort pouches with very low failure rates.