Eugene Nielsen presents background, features, and a review of the CellVault-5M Modular Battery Case in this Spotter Up article published in the summer of 2021.  Mr. Nielsen provides high levels of detail including comments about rattle (there is none), relationship to other Thyrm designs such as the CellVault and DarkVault, and his opinion about the CellVault-5M in the battery case market.  “…the THYRM CellVault-5M is an outstanding piece of kit. It is exceptionally well designed and well-made. Not only does it keeps spare batteries protected, secure and organized, it offers a level of user-configurability for multiple battery types not found in other spare battery carriers.”