In John Irving's "Avenue of Mysteries," a customs officer provides a concise summary to a young American traveler named Edward Bonshaw. He lists the essentials that travelers should have, which include clothes, whips, and reading material. This highlights the practicality and straightforwardness often found in customs regulations, emphasizing the importance of having just the necessities when crossing borders.

The encounter showcases the cultural exchange and communication between the officer and Bonshaw, illustrating how simple interactions can reflect larger themes of travel and identity. Irving's narrative captures these moments that resonate with readers, offering a glimpse into the protagonist's experiences as he navigates both physical and metaphorical journeys.