Bringing a UPS overseas to use the line-conditioning feature seems like overkill, and a big weight hassle. Why not buy one of those Belkin surge protector strips? Your intent is to mostly recharge portable electronics, so over-voltage and surge conditions are the biggest worries. If there's under-voltage or current sag, it doesn't matter because those devices just trickle charge. Besides after your trip, you can always use another surge-protected strip around the house.