Hydrogen storage in filament-wound pressure vessel with aluminum liner has been considered to be the simplest method affording the best economy under current condition. The cost, efficiency, and safety of a hydrogen storage system are closely related to the vessel's pressure capacity. Through intensive research, the cost-effectiveness of a hydrogen system was found to vary non-linearly with storage pressure. When the storage-pressure is kept between 50 and 55 MPa, the cost-effectiveness of a hydrogen storage system offers the best tradeoff. In addition, the trend of vehicular hydrogen storage pressure that satisfies the best cost-effectiveness is predicted to improve with the advance in technology and when capacity improvement will be realized in the future. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.