what
mattm said. We were getting along just fine without them. I routinely put in 5-6 hour rides with a 20+ degree temperature differential and I manage to carry enough food. The pockets are stuffed with food when I leave and clothing when I return.
But if you want your IG/social media to start trending, or to otherwise seem hip/cool, it's time for the bag.
__________________
"Your beauty is an aeroplane;
so high, my heart cannot bear the strain." -A.C. Jobim, Triste