item

Context:Thank you for your letter we are sorry to learn that some items in your luggage may be taken by another passenger. Source: A letter from Air China-Baggage Department

Definition: [c] a single thing, especially one thing in a list, group, or set of things. Eg: He opened the cardboard box and took out each item. The store is having a sale on furniture and household item. (Source: Longman Dictionary Contemporary English (2005), Person Education Limited)