[LargeFormat] Bag Bellows Material

[Clive Warren]

Have decided to make some bag bellows for a camera that was never 
intended to use them. This is of course for the continuing saga of 
the 6x17cm format camera. If I win the lottery on Saturday then I 
probably won't need to ask this next question - but just in case I 
don't.....

Can anyone suggest an appropriate material to use to make some bag 
bellows?  A friend has a sewing machine and if I ask nicely enough 
could probably be persuaded to help out on the sewing front.

Cheers,
        Clive