Advice What to Pack for the Ha Giang Loop?

Planning to tackle the Ha Giang Loop soon and trying to figure out what's essential to pack. I know cash is a must since ATMs are scarce, and if I'm driving, I'll need my driver’s license and an International Driving Permit. But what else should I not forget? Any specific gear or items that made your trip smoother or more enjoyable? Also, any tips on managing luggage on a motorbike would be super helpful. Looking forward to your advice!