That's why I drive.
Backpack goes in the back seat of my enjoyable peaceful ride.

where is it that i should have my BACKpack?

and sorry, but it seems to be a particular culture/race that loves to keep their backpacks on in a cramped bus/Skytrain car.
I

I do take it off on transit but whether it's on my back or on the floor it's taking up the same amount of space.

It's the bus driver's job to tell these morons to move to the back but they don't do shit.