Both are correct. Either Travel or Travels can be an appropriate name for a collection of your trip memorabilia. The noun travel has more than one meaning. Here are the first two meanings given by Google [ define travel ]:
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The key difference between trip and travel is that trip is a noun that indicates a relatively short journey whereas travel is a verb referring to the movement of people between distant geographical locations. In a general sense, both these words, trip and travel, have similar meanings.