You can use a gmail account with gmail drive.
http://www.viksoe.dk/code/gmail.htm
It essentially shows your gmail account as a drive on your computer than you can just copy files to/from. Might be a nice option for your laptop.
You might also want to consider just bringing a usb stick with you. Upload speeds can be really slow depending on where you're going and uploading 3-5 GB could take a long time. You can buy a 16GB usb2 stick for around $40-50 these days.