We will be flying to California for a mini-reunion with some high school friends, sharing a beach house. I plan to bake a couple of things for the group meals (cornbread for one and clafoutis for another) and will be taking my own baking mixes so I don't have to spend time shopping for the specialized ingredients there. I recall something about taking "powders" through TSA, but don't know if they are restricted in amount, or simply subject to inspection. I will have about four cups in all. Will this be a problem? Should I plan to check the bag the flours are in? I can do that but will have to pack differently. Flight is tomorrow.