The BCA Float and Throttle 22 and the ABS 24 by Ortovox are darn near the exact same weight. Within ounces of each other, ready to ride sitting in our store. When your looking directly at ABS models though, the Vario is actually the most minimalistic and lightest. The problem that you have with comparing ABS models though is that there are three base units. Vario, Vario Limited, and Powder. Again these are current models, there were other models in years past. The issue seen though is you can have the lightest base system, but still zip on a 32 or 45+5 zip on to that base unit. So then the lightest base system then becomes a very heavy piece if you fill it. Rather than focusing on weight of the bags empty it is more important to figure out what you need to store in the bag, who stores it the best, and is easiest to use for you. Then just not pack them full of unnecessary things that ad weight. The bags empty are all close enough in weight that the noticeable weight will be what you put in the bag, and that shouldn't change depending on what bag you have. Essentials are essentials, and should be carried the same in each option. As we have mentioned before, if you buy a bag that has a ton of storage you tent to fill it, which makes it heavy. Which is why we suggest customers make a list or lay out what they want in the bag, and then judge what size they need at that point. The owner here, runs an 18L version of the Avi-Vest and he is confident he could live and sustain for several days with what is on his body in that limited amount of space.
We are always happy to answer any questions about specifics, we get the opportunity to run many of the bags from year to year, and have run all the current options in the late spring of last year.