Bladder tanks?

[aeroz_z]

Just out of interest after a couple of recent fatal aircraft accidents here in Australia, where the accident itself has not been fatal but the fire that followed. Has anyone ever fitted a bladder type fuel tank to a rag and tube aircraft?
What are the pro's and cons?
Just seems like a good idea in the type of aircraft we fly where the fuel tank can be sitting on your lap, which would not be ideal come an accident.

 

[christopher]

 

[bigblackmastiff]

 

[cwilliamrose]

 

[PittsDriver68]