What is the primary purpose of the harness system in the MSA G1 SCBA?

The primary purpose of the harness system in the MSA G1 SCBA is to support the weight of the air cylinder. This is crucial because the air cylinder is typically the heaviest component of the SCBA, and proper support ensures that the user can operate without excessive strain or discomfort. The harness is designed to hold the cylinder securely in place, allowing for better balance and mobility during use.

A well-designed harness not only supports the weight of the cylinder but also aids in distributing that weight across the user's back and shoulders, which enhances comfort during extended wear. While the other options cover important aspects of the harness system, such as fitting and ease of use, the central role it plays in supporting the air cylinder stands out as its primary function.