What do I need to do a border run from Thailand to Cambodia at Poipet?

The border at Poipet, Cambodia, is currently open, but it is generally advised against using this crossing for a border run due to various reported difficulties, especially if traveling alone. The cost for the border crossing is around $30 USD. When crossing into Cambodia, you will need your passport. Upon returning to Thailand, you should present your passport and, ideally, a printout of your Thai Multiple Entry Tourist Visa (METV) to avoid issues with the length of your stay, although some claim it's not strictly necessary. Using an authorized border run company is recommended to mitigate potential hassles.