In the backcountry during winter, the trade offs between different route options, time, anticipated snow conditions, slopes to be traveled, and hazards from above determine the route. An Avalung or Avalanche Airbag is designed as a "worst case" tool, to increase the odds of survival when the snow comes out during a trip. More than likely, well executed search and find rescue by other members of the group will also be necessary. Re-loadable CO2 cartridges or rechargeable batteries are fundamental technologies that must be considered. Talk to an expert.