The concern with bear-bagging is that it's very difficult to do correctly, in that a) the trees may not cooperate and provide a good hanging location and b) bears are getting smarter about bear hangs all the time.

This article from Andrew Skurka changed my mind and made me an advocate of bear canisters.  I'm kinda surprised it hasn't been linked yet 😃 https://andrewskurka.com/argument-against-hanging-bear-bag/