Depends on the mission, sometimes I carry full camping/ cooking kit.
When I started I would carry way too much.(like the european and usa trips)
For Thailand just lightweight easy to wash high visibiilty clothing. For most Thailand travel you can manage without camping gear, as there are many cheap motels and bungaloes all over.
Each trip I learn a bit more on how to reduce weight.
The more minimalist you get the more you get the true sense of freedom and liberty the cycle tourist can experience.
That said there are some amazing stories of cyclists touring on cargo bikes crossing Siberia in winter with full winter camping kit!