Hi Karenkay, You will always be transfering through Bangkok where the liquid ban is in force, the only exception maybe Chiang Mai to Phuket, but my guess as both are International departure points, you will checked again. I carry my liquids in 2 purpose manufactured plastic bags (the rules state one) which I extract from the carry on prior to inspection. They are always intensely inspected, whilst giving the impression, they don't have a clue what's in any If you travel C domestic, you will get away with "a lot", enjoy your travels around Thailand, regards bkkrop