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Belt Loop Attachment 3-way Propulsion Harness. 2 liter hydration bladder with a Slideseal top closure and bite valve. Rapid Access bladder pocket. Large, dimensional Power Stretch Mesh pocket on each shoulder strap. Honeycomb Mesh shoulder straps and back panel add comfort, prevent chafing, and dissipate heat. Air Scoop with ventilation channel. Vertically adjustable sternum strap with drink tube clip. External zippered pocket.