If the area is actually controlled by ski patrol for avalanche danger, you probably don't need an airbag. Yes avalanches can happen even on controlled terrain, but it's pretty unlikely. Ski Patrols everywhere do an amazing job keeping the slopes safe. If you are ducking out of a gate to do some actual backcountry riding than an airbag is not a bad thing. An airbag likely saved a female in the tunnel creek avalanche event on Stevens Pass last year. Which is decidedly sidecountry accessed from the resort. There are several 20-24 liter models that are basically the size of a heli pro. So it'll work just fine for this sort of activity.