Before photo processing was easy and inexpensive (relatively) and long before digital cameras, travelers would not have the option of taking many, or indeed any, pictures of their trips. Instead they bought postcards as rememberances. Packets of 10 or 20 small postcards in a mailer like the one shown here were very popular. Also available were strips of many postcards that were attached by perforations so they could be separated for mailing. These were folded accordion-style and were fun to drop open to show pictures of your trip to friends. A number of publishers specialized in photos of towns and cities all over the world and printed them on linen. Of course, we still buy postcards but no longer have to rely on them to jog memories.