Multiple things can be true at the same time. In this instance, it’s true that more people wearing backpacks need to be conscious of how much more room their bodies take up because of them, and, yes, there are situations in which, if you can, you should remove them. However, it’s also true that Michael Callahan is an asshole. One good thing to come out of this nonsense, however, is Ernie Smith’s history of backpacks over on Tedium.