Backcountry Access Float 2.0 42L Avalanche Backpack. Also comes with Float 2.0 cylinder (charged). Backpack retails $700 and cylinder retails at $200. Two days out since purchasing last year. Great condition.  Will sell set for $500.  Good size for big days or overnight hut adventure.  More info at outdoor gear lab review below:

https://www.outdoorgearlab.com/reviews/snow-sports/avalanche-airbag/backcountry-access-float-42