I was recently backpacking in a relatively remote area in Washington where black bears are known to be present. For this trip we've only packed single use dry food bags in their original packaging and some snacks. After finishing dinner, we've packaged the remains tightly into a garbage bag (that was placed some distance away from camp) and only had factory sealed food remaining.
Did these factory sealed food packets need to be in a bear canister or hung on a tree? As a human I can't smell any of them but I know that bears are a lot more sensitive.