Cases for French Horns by Marcus Bonna. Detachable Bell and Fixed bell Flight cases made by Marcus Bonna! Marcus Bonna cases are completely handmade and unrivaled in regard to strength, compact size and lightweight. A fiberglass shell is combined with a durable and replaceable cordura or leather cover. Backpack straps are included and most cases come with shoulder straps as well. Adjustable pads inside the case allow you to fit the case to your instrument. Marcus Bonna cases fit in virtually all airplane overhead compartments. Marcus Bonna cases are offered in black, brown, blue, wine, green1, green2, red, gray, moss green, turquoise and yellow colors in the nylon finish and black, brown and burgundy in the leather covering.