Crossrock CRDG300TUBK Deluxe Hybrid Tenor Ukulele Bag Exterior uses high end 1680D twill polyester material. Interior uses super soft velvet lining layer, 30 mm multi layers high density padding foam and reinforced rigid plastic sidewalls ,providing all-around protection to your instrument. Exterior has a rigid EVA sheet music pockets for multi-storage and rugged but comfortable handle. It is equipped with ergonomic, adjustable stow away backpack straps. It has anti-wear base and rubber hard-edge piping protection system on the bottom to reduce abrasion.