International airports have become the new battlefield for the country's top internet companies as they gear up for over-seas expansion by providing Chinese outbound travelers with more e-wallet services.

The timing is ideal, as millions of tourists pack their bags right before the National Day holiday, from Oct 1 to 7.

China's online search giant Baidu Inc announced on Thursday a partnership with Israeli startup Travelers Box to provide a convenient way for Chinese travelers to exchange their unused foreign money before returning home.