Don't just remember the lid, TAPE the lid on. I had this happen with an entire can of mousse where even though it had a snug fitting cap, it still got knocked off somehow and the button pushed to where the entire can emptied
out into the suitcase. Luckily it was inside a smaller bag with shampoos and other bottles that could be easily washed off. It was a REALLY good smelling mousse and to this day you can still smell it when you open the bag.