What’s the first thing to do when you step in a hotel room? Test out the mattress? Raid the minibar? Peep the view? Check your hotel room for intruders or other hotel safety issues? Maybe you set your brand-new luggage set on the bed and start unpacking. Or maybe you put your suitcase in the bathtub. That’s right, the bathtub! But why would you put your luggage in the hotel bathroom, you ask?There’s actually a really gross reason. Here’s what the experts say.