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To facilitate the passing of queue messages that are 1GB in size, both utilizing S3 as a storage mechanism and employing the SQS Extended Client Library is necessary.

The SQS Extended Client Library allows you to use Amazon Simple Queue Service (SQS) for message queuing, while storing the payload of larger messages, like 1GB, in Amazon S3. This approach is essential because SQS natively supports a maximum message size of 256KB. By leveraging the SQS Extended Client Library, you can send and receive messages where the message body is stored in S3, and SQS only stores a reference to that data. The library handles the complexity of integrating SQS with S3, enabling applications to work with larger payloads seamlessly.

Using S3 as a storage mechanism specifically addresses the limitations of message size in SQS. Since S3 can handle very large files, it becomes an effective solution for storing content that exceeds the direct limitations imposed by SQS message size constraints.

Therefore, both mechanisms are integral to successfully managing large messages, making it essential to implement both the Extended Client Library and S3 together for effective message delivery in these scenarios.