Pack light! You don’t need much. Keep in mind that Thailand is a tropical country where you rarely need any cold-weather clothing or jackets. Laundry is very cheap and you can purchase anything you need over here, so pack less than you think you will need. If you want to visit Thai temples (wats) you should bring one pair of lightweight long pants (and women need to cover their shoulders and arms). There are 7/11?s on every street corner where you can get snacks, basic toiletries and household items.