[Mollypitcher1]

The french word manteau means coat,porte meaning to carry, so porte manteau means a clothes carrier...literally a leather trunk. There are many french words which have an opposite meaning in English and are called “faux amis,” or “False Friends.” One must be very very careful with some of them in order not to become a red-faced idiot in genteel company.

[captain_dave]

During the Napoleonic wars the French cavalry called the bed roll bag that fit behind the saddle a portmanteau. To me that's a saddlebag.