I'm a big fan of the various different sizes of Warwick gigbags and keep several instruments in them, including an old Windsor zither banjo and a new mandolin. I bought the Rockbag RB 20635B specifically for a couple of short scale open backed tenor banjos (including one 17 fret tenor banjo made by Oakwood instruments, with a 48cm scale length) and it's a very good fit - would probably take a slightly longer scale length instrument too. Not sure if it would fit a resonator backed banjo but the good thing about Warwick is you can check all the dimensions online.
The quality on these gigbags seems very high, tough fabric, good zippers and well-secured handles including backpack-style straps, excellent pockets for storing spare strings and other bits and pieces. The thick padding provides excellent protection and the plush interior protects your instrument's finish. I used this gigbag to take one of my banjos on a transatlantic flight and it seemed very safe in the overhead locker.
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