yeah, they will not catch it if you are smart. I took gold fish in a one gallon tank on the plane in my seat. They tipped over in the X-Ray machine. I applologised profusely about my water bottle not being screwed on tight enough. The lid was good, but not tight enough to stop all water from getting out. They took me asside to do a more thurough search. I lifted the container, with a opeque lid, part way out of my cooler bag, after opening all zippers. They did not see the fish, and after searching me thuroughly, let me on the plane. This was after the bag people told me I can't take fish on the plane.
But rogaine should be easy to take onboard. And yes, a week is enough to have a huge shed that won't stop until you are back to square one.