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I have mailed many different items over the years. Including calculators, cups and leather binders. Talk about lumpy and expensive. (not very bright)
The most successful in getting my piece opened at a reasonable price was Emory Boards. Flat, very cheap and the person could feel it in the envelope. I used them when I was doing orphan campaigns. One side had the insurance company name (credibility and authority) the other had my contact information.
Refrigerator magnet calendars and "In case of emergency" magnet cards did well with seniors. The advantages of those are. They fit in a #10 envelope, they do not cost extra to mail, they have a limited shelf life, they are designed to be displayed useful and not salesy. With a nice color laser printer they can be personalized.
Emory boards sound like a really good idea.
couple others I've never seen but I would like to receive.
chapstick
finger nail clippers
Ones that I get that I use are cool return of address labels.