Not the greatest. I was expecting a lot more, considering that this is Andertons top of the Ritter range for bass. The phrase "you get what you pay for" is most apt here, but it claims to be a lot more than the actual reality, so that's hardly an excuse.
Firstly, I found that the dimensions in general were totally unsuitable for my Fender Jazz (not the most uncommon bass shape). The fit was way too snug, meaning that to zip the bag up, I had to hold the sides together whilst zipping. Ridiculous, really.
This problem also transferred to the outer pockets, which have virtually no depth, so once the bass is stuffed in to the main compartment and zipped up, they are so tight you can hardly get your hand in. Not exaggerating in the slightest here.
Also, on the subject of the outer pockets, I found that the zip on one of them broke immediately on first use. Nice.
Finally, the inner lining is a very thin nylon sheet, not plush/velvety like almost all other bags (even much cheaper ones). Coupled with the tightness of the bag, your tuners or anything else sticking out of the bass are going to rip that in no time.
Other than that, great bag! ;-)