Klean Kanteen Single Wall Stainless Steel Food Canister Container with Leak Proof Stainless Steel Interior Lid Leak-proof airtight and shatter-proof 18/8 food-grade stainless steel 100-Percent stainless interior Does not retain or impart flavors Bulk ready and grease pencil friendly Leak-proof, airtight and shatter-proof These are single walled and are NOT intended for keeping items hot or cold.