I need to get some peace lilies safely from the U.S. to Japan. This requires careful planning and skilled execution to protect the flowers. My current plan is to take a lunch bag with a cooling back, reinforced with cardboard, while the flowers will be contained within a plastic clamshell container (like from take out places) with getting ness. water/nutrients from those stem tubes some flower shops have. Any potential refinements to make? Or will this work.