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We can not be expected to be treated like professionals and compensated like professionals if we are incapable of CARRYING ourselves like professionals.
That means that give the same attention to detail to the way you LOOK as you do to the way you fly your airplane.
Yes, friends. Backpacks are unprofessional. If you REALLY need that extra storage capacity, most luggage manufacturers make a "gym bag" that matches your luggage and is designed to go over the handle of your rollaboard and clip to the top.
If you were lying on the operating table, the doctor shows up wearing a t-shirt that says, "Beer: Getting White Guys Laid for 200 years", shorts, and sandles... is that ok?
If you're in a courtroom being defended by an attorney who, instead of a suit, wears a wife-beater, sweatpants, and nikes that light-up when he steps... is that ok?