"Perhaps because it only takes a few minutes to download digital entertainment," she said.
Tech-savvy travel is a booming business. Before every week-long holiday, the standard traveller buys 13 new songs, two new e-books, one new film and a new TV episode.
The trend highlights the burgeoning divide between travellers of different generations. For example, those under 35 are almost twice as likely to invest in a "digital suitcase" than those over 55.
Millennials are also far more likely to travel abroad than their parents, and they're spending more on travel than any other generation in history.
In fact, Westpac's latest Travel Finance Report shows Australia's Gen Y have shelled-out a whopping A$11.3 billion (NZ$12 billion) on travel over the past 12 months, at an average cost of A$3461 (NZ$3661) per trip.
Ashley Gray, Westpac's head of youth and millennial markets, said while many young people were good at saving, researching their destination would help their dollars stretch further.
"Create a daily budget that takes into account current exchange rates and the cost of food and drinks, transport and sightseeing," he advised.
He also said to avoid carrying big wads of cash, adding that resisting impulse buys and booking in advance can help stretch your travel budget even further.
It's probably worth adding your bank's app to your download list, while you're at it.