@optoabhi - depends on what platform you're on when you travel, assuming it's Android or iOS there are apps such as Calibre Companion, Libreca and others that can access a calibre library on an external disk or cloud storage via the library database.
Or you could make your library available over 'net using calibre server, and access it via a browser.
Or you could do as DNSB suggests and use the Save to Disk feature to save books in a subject folder hierarchy - caveat: off-hand I'm not sure if there's a way to transform a calibre tag hierarchy into a folder hierarchy.
Personally I never need access to more than a dozen e-books when travelling, so I just copy the format files I think I might need from the library to my tablet and access them via an old ES File Manager app. I have a backup of my library on an FTP server so if I really need something else I can get it from there.
BR
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