Abs vario 45 zip on backpackt the abs vario 45 zip on backpack has been designed to be easily attached to the powder base unit with the twinbag avalanche airbed system along with a large 50l main compartment with a separate emergency compartment that makes it perfect for long trips and tours that may last for days this abs backpack also features mounts for skis snowboards snowshoes ice axes along with a daisy chain option for convenient mounting options complete with an sos etiquette label