In reply to Jack.H.92:
What size of bag do you need for ice climbing? That depends upon the ice climbing.
If you are doing single pitch climbs from the roadside, do you need a rucksack for climbing at all? Just carry your kit to the foot of the climb in a holdall.
If you are doing ice climbs that require a walk-in of a few hours, then you need the kit for a winter day on the hill. Here you will need a rucksack. Depending on the climb, are you better to have everyone carry a rucksack? Could you get away with carrying one sack between two, with the second carrying the bag? If you alternate leads you can avoid resentment. And you can swap the bags during the walk-in.
Or perhaps you are going to be out for several days, during which time you will attempt more than one climb. Perhaps staying in huts. Perhaps camping. In each situation, your load carrying needs will vary.
I'm not saying this to be smart, but to warn you of the slippery slope that you are standing on. Before you know it, 4 years will have passed, and you will be on UKC having discussions about the best rucksack for your upcoming trip to the Yukon or to Pabbay or to wherever, because none of the 6 different rucksacks you currently own is quite right...
(My current store is 7 rucksacks in good nick, plus a couple that I wouldn't use for anything serious but which work for carrying kit to the climbing wall or on and off ferries)