I bought these saddle bags and am happy with them. And let me tell you, they are FREAKING HUGE! They fit the Lifan almost perfectly though.
Saddlebags
This tail bag sounds good too, it's very large and converts to a daypack so you don't have to leave it when the bike is parked.
Tankbag
Just don't bother with the jackets listed, they suck (it's like wearing a garbage bag).