I'm still on the lookout for the perfect bag to be honest. I've used the Rapala sling bag, the Ultimate one, the Shimano Lure case etc etc. Last weekend I used the shimano lure case with a backpack as well, and this still wasn't ideal.
Problems with each:
Rapala:
Limited space for anything but lures. Ok, you can store more than lures in the boxes, but it's not perfect. Great idea overall though. Zips are going on mine. One shoulder carrying can ache after a while. I'd just like more space for bits and pieces.
Ultimate:
Overall very good. I'll be going back to this one for now. I can't see it lasting forever though. Compared to the Rapala the zips are fairly lightweight, and combined with thin material overall, I can see either the zips failing, or the material wripping. For what is a reasonably specialist bit of luggage - aimed at lure anglers, I think they could actually have made a better quality bag and charged a bit more for it. It's great value overall, but I'd love it if they made a more hardcore version. I'd be happy to pay extra. I'd also like to see it laid out a little differently. The main section is ideal for 2 Sakura boxes for hard lures, but I'd actually like another, smaller section in front of this for soft baits. The middle, current zipped section is a bit too much of an allrounder at the moment, and I'd prefer it as a standard pocket. The foam hook board never gets used. The front pocket could also be a bit bigger. And the side pocket shouldn't zip so low. Anything you put in it is likely to fall out if fully unzipped. Shoulder can also ache massively after a while. If a bag could be designed with 2 shoulder straps, but still slide around your side, it'd be ideal!