Cases and bags are essential for protecting musical instruments, recording equipment, and sound gear during transportation and storage. The design and materials vary depending on the equipment being protected, with hard cases providing maximum protection and soft bags offering more portability. Key brands include Gator Cases, SKB, Mono, and Pelican. Cases and bags are vital for musicians and audio engineers on the go, ensuring that instruments and equipment remain safe from damage, dust, and moisture during travel, especially for touring musicians and those with extensive gear setups.