What is the purpose of the ride?
If you ha r a destination that requires a separate set of clothes, or special gear, etc. then do what needs to be done to get there eh
I highly recommend not riding with a back pack. I have tried a few riding back packs ( including the Ogio no drag series. ) each one has had a comfort fault with either shoulders, back, posture, and worst of all
NECK PAIN and limited helmet movement. When I'm a corner, especially on street, I never want my field of vision compromises. My solution is a tank bag
I have a rapid transit 19L, and it gets the job done well for me
I keep my tools. Medical ( enough to stabilize a serious trauma for at least a minute or two ) personal tourniquet. Extra clothes ( shorts shirt )
Most important. Water. Have a hydration bladder 2L and a few snickers bars.
Also. It has a top cover for map/ registration paperwork etc, and a pocket that fits most medium sized smart phones. ( iPhone 5 does great. 6 is too big for it)
I pair with my Bluetooth so all I gotta do is tap my helmet and accept a call, listen to a text and voice respond, play music. Etc
The only down side I have found is you can't hang off well as it impedes your BP of arm on tank, and you can't get into a tuck position.
( but when on street, do you need to do either?? )
A tailbag is also nice, but I ride two up with the lady, so having a tank bag is nice for both of us. Get a long adapter,l for the camel back, and she can drink and ride too. ( although I give her frequent brakes to stretch)
That is my compromise eh
If you need a lot of gear
Either 1. Which is safer. Drive
Or 2. Wear a back packing/ hiking backpack or your no drag and take stops to stretch the neck out
Just my 2c