Osprey Packs Zealot 16 Hydration Pack with Reservoir AirScape Suspension: The Zealot AirScape Suspension uses ridge molded foam to create a lightweight yet supportive and ventilated backpanel. Back Panel Zip: The backpanel zip offers wide access to the main compartment without removing gear attached to the front of the pack. BioStretch Harness: EVA foam is perforated with large holes for enhanced breathability and comfortable stretch. Breathable spacer mesh wraps up over edges of foam to create soft, irritation-free contact surface. Blinker Light Attachment: An attachment point is provided for blinker lights. Front Compression Pocket: A padded front compression pocket combines with stretch mesh side pockets for carrying body armor or other bulky items.