Here's how me and my photography partner transfer stuff back and forth (I have done this on my iMac but that really doesn't matter).


PP as normal on your laptop. When your ready to transfer over, highlight all all the images you want to move, go up to the tool bar and click on 'Export as Catalog'. iirc, you tell it where to transfer the LR.Cat file and all the images which are duplicated from your originals into a new folder. we usually transfer them onto a CF card in a USB reader or to a USB port with a flash drive (if its large enough).


Then just pop the flash card or drive into you iMac and 'Import LR Catalog', tell it where the files are and where you want it copied to.


I just did this again last night but that was good advise to at test it prior to your trip with at least one PP'd image so you know what to expect.


Have fun on vacation


Dave