flight bags
It costs in fuel so every extra gram should be rejected.
What could you possibly need a bag for when you have both hands occupied for hours on end? Unless you are overnight stopping of course and then you just need a credit card and a small amount of cash.
Travel light - be green and realistic.
If you have a large baggage capacity spare carry a spare GPS and beacon
Or just do as you like, do we all want to be the same?
Edit: If you know why you need a bag you know what you want to carry so will a carrier bag do? or is fashion a consdieration?