A day pack with expandable mesh side pockets large enough for Nalgene Bottle. Pack side panel form is anatomically cut for an adult pack. Shoulder straps with a tricot mesh fabric against the body, and a fully adjustable sternum strap with whistle. A fully padded back panel, 2" webbing hip strap. #8YKK  Zippered top pocket. Main pack H-19" W-12" D-7" Top pocket H-3" W-12" D-7"