The Subterra 21L Backpack is a versatile daypack with a 21-liter capacity designed to carry a full day's gear. Made from durable polyester to protect valuables, it features soft padded shoulder straps for comfort, two side mesh pockets for water bottles or umbrellas, and a hidden back panel security pocket. It includes a large 16-inch laptop sleeve and a zippered tech pocket for power banks and cords.