I think cyclists fall into three camps when it comes to moving things by bike: bag on bike, bag on person or basket. And, then there are some weirdos use pockets or plastic bags hanging from bar ends.
I used to always put my bag on my back, but then I started carrying heavier things longer distances. That makes for back pain and sweat. So, I invested in Ortleib Roller Classics (for the back rack) and my life has changed in so many positive ways. They're so waterproof that it's incomprehensible and practically take themselves on and off the bike. Even yesterday as I was ruining by hubs and bottom bracket in the flooded meadows, my pannier contents stayed dry.
Speaking of carrying things around. Soup art returns! Tomorrow at 7pm!