The Travel Trilogy was a compilation of three of Gilderoy Lockhart's collected works: Holidays with Hags, Voyages with Vampires and Wanderings with Werewolves. Presumably for convenience, some students appeared to have bought it and took it to Defence Against the Dark Arts class in the 1992-1993 school year, along with the other required textbooks. 
There seems to be a version of two covers; one being red, other being brown.
- Harry Potter and the Chamber of Secrets (film) (First appearance)
- The Wizarding World of Harry Potter