S3 Express One Zone

S3 Express One Zone (S3E1Z) is missing numerous standard S3 features including object version support, bucket tags, object locks, object tags, and MD5 checksum ETags. It cannot be treated like a normal S3 bucket and lacks multi-zone support, forcing developers to design around deficiencies.

S3 Express One Zone costs $0.16/GB, twice the price of EBS general purpose SSD (gp3), making it an expensive option relative to its limited feature set and single-zone constraint. For the cost, it functions more like an expensive EBS with a half-implemented S3 API.