Abs vario18 zip on backpack the abs vario18 zip on backpack has been designed to be used with the powder base unit with the twinbag system along with a large main compartment with two zipped entries to allow for easy access to items at the bottom of the bag this abs bag also features an sos etiquette panel with international emergency numbers in the front large pocket completed with abs branding to the front avalanche airbag backpack attaches to the powder base unit and twinbag sy