A company called CompactDrive makes a very nice portable storage unit. They sell it with or without hard drives, so you can get any capacity you think you'll need for China.
It won't let you review Aptus files in the field (in fact, the one I own--PD70x) only has a simple LCD screen and won't let you review any files...
Two reasons I mention this particular unit--it copies very quickly--16MB/s if your card can keep up. This means the transfer gets done faster and gives you more GB of transfers per battery charge. The other is that the unit has a bit-for-bit verify mode (copies entire card first pass, verifies entire card matches hard disk, second pass). It'll double the transfer time, but at least you can be certain your data has been copied correctly.
They're at www.compactdrive.com. And for the record, I have no affiliation CompactDrive. I'm just a satisfied customer.

I bought a little over a year ago ahead of a 3-week trip to India, which included a 5-day Himalyan hike away from all power. This solution worked for me perfectly.
Hope that helps,
Brad