To backpack or not to backpack

I'm a BIG fan of backpacks for luggage. Don't get me wrong, a nice roller bag has some perks, but when it comes to any kind of travel where there are more than two modes of transportation involved, there's nothing better than just being able to throw a backpack on your shoulders and GO. I bought one when I went to Europe in 2000 (can't believe it's been 10 years since that trip...sigh) and still use it today, it's amazing and zips all the way around so you can get to everything just like a suitcase. Why do backpacks get a bad wrap once you pass age 22?? I've become a bit of a backpack pusher...but keep getting the same look of disgust as a response. I'm sorry, but there is nothing sophisticated about dragging a huge roller bag across old sidewalks and having it flop all over the place. C'mon, even in New York you see these fools attempting to cross the street with an uncooperative piece of luggage and you sympathize. Too cool for a backpack? You look like an idiot. And, no, you don't need dreads or birks to carry one.