Have you tried the Black Diamond Halo 28 Jetforce Avalanche Pack?
no I haven’t but it definitely looks worth a look. The 28L is way to small for my use as a guide but there is a 40L pack that looks pretty nice but at a cost!
I haven’t heard much about the operational quality of the system but BD are pretty on it in terms of equipment so I’d expect them to have done the maths.
I use the ABS Vario and I do like to be able to change the pack size with the zip on and off volumes for different style days on the hill.
If you get one of the BD packs I’ll be interested to see it, but obviously also see you not use it!!