Hard case for an acoustic guitar, likely a dreadnought or similar size. Here's some helpful information:
Purpose:
Protects the guitar from physical damage, temperature changes, and humidity during storage and transport.
Material:
Often made of hard plastic, fiberglass, or wood with a padded interior.
Features:
Latches or zippers to secure the case.
Handle for carrying.
Interior molded to fit the shape of the guitar.
Storage compartment for accessories.