The invention relates to an avalanche airbag system (10) comprising an airbag (14) and a filling device (20) for introducing ambient air into the airbag (14). The filling device (20) comprises a fan (16) with an electric motor (18), a first electric energy storage (22, 40) for providing electric energy to the electric motor (18), a second electric energy storage (24) and a control device (26) for actuating the electric motor (18). By means of the control device (26) depending on at least one parameter both a supplying of the electric motor (18) with electric energy originating from both energy storages (22, 40, 24) as well as with electric energy originating from only one of the two energy storages (22, 40, 24) can be effected. Moreover, the invention relates to a backpack comprising such an avalanche airbag system (10) and a method for operating such an avalanche airbag system (10).