are bladders interchangeable?

[Zaza]

How interchangeable are bladders?
for instance, my title 9x6 came with a replacement orange bladder. Can I use that bladder on a different make/model bag and how close to the same size and shape must it be to be interchangeable? thanks. mike

It will fit in any bag (of about the same size)... put the orange one in, it makes the bag better!

[speedy G]

How interchangeable are bladders?
for instance, my title 9x6 came with a replacement orange bladder. Can I use that bladder on a different make/model bag and how close to the same size and shape must it be to be interchangeable? thanks. mike