Marcus Bonna Replacement Backpack Strap, 1 piece (Carabiner Model

New England's Premier Winds & Brass Pro Shop

Marcus Bonna Case for Single Trumpet with Backpack Strap — Cromer

Brass Instrument Cases - Virtuosity

Marcus Bonna Replacement Backpack Strap - Sold individually

Backpack Straps for Instrument Cases – Charles Double Reed Company

Marcus Bonna MB-2RM Case for French Horn – Thomann United States

Backpack Strap Only, for Marcus Bonna Case – RDG Woodwinds, Inc.

MARCUS BONNA - Chuck Levin's Washington Music Center

Marcus Bonna - Backpack Straps

Marcus Bonna 1 Trumpet Semi-hard Case with backpack strap

Marcus Bonna MB Baby 03/1BDB Trombone Case, Detachable Bell

Brass Instrument Cases - Virtuosity

Backpack Straps with Carabiner Closure MB Model Suitable for all Marcus Bonna models Offers more security More practical when the instrument must be

Marcus Bonna Backpack Strap Carabiner MB

The Horn Guys - Marcus Bonna Backpack Straps, Each