The EVOC Zip-On ABS Base Unit is a convenient, and versatile, avalanche backpack carrying system that is compatible with all EVOC Zip-On ABS top attachments, and designed to carry heavy loads efficiently, and ergonomically. It comes equipped with EVOC's Neutralite System which features an adapted hip belt to reduce weight stress by absorbing it neutrally; wide, padded, ergonomic shoulders straps, and a wide neck cut out to keep the backpack in place and prevent slipping. It also features a hip belt (removable, attachable 90 - 130 cm), signal whistle, hydration clip and hip belt pocket.