The iGig bag is very good for your application.
Positives: Great construction, massive pockets (including a large pocket that is specifically designed to hold a micro head, good straps and decent protection (although a touch less than some harder sided hybrids like the inCase Slim or Sadowksy bag
Negatives: Relatively pricey, a little cumbersome to get the bass in and out if you have a ton of stuff in those big pockets, given the dual 'strapdown' neck system and 'less than rigid' top. Also, the bag itself is not particularly heavy compared to other hybrids, but once you get a bass, a small amp, all the cords, cables, extension cords, tuner, etc., etc. that you need on a gig, it gets pretty hefty on your back.
All in all, it's a very good bag for those that want to fit a lot of stuff in their bass case.
IMO and IME!
Edit: The G515 is the model I'm talking about.