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Wiktionary
road case

n. Cases built for musicians, production companies, and industry. Many cases are constructed using quality materials and assembled by hand to protect musical instruments.

Wikipedia
Road case

A road case, roadie case, ATA case or flight case is a shipping container specifically built to protect musical instruments, motion picture equipment, audio and lighting production equipment, properties, or other sensitive equipment when it must be moved between locations, or frequently thrown around by airport baggage-handling personnel. A large number of varying-sized road cases can be built to outfit the needs of an entire touring production company, or custom designed individually for a specific industry or product.

The term road case is mostly used in the United States and implies that the case is primarily for road based travel, unlike a flight case. The term originates from its use for storing and shipping band equipment while the musicians were on the road.