We took all the feedback, both positive and negative from the DolfinPack V1 and we went back to the drawing board. We wrapped the elastic straps in neoprene to provide unmatched comfort and eliminate all chaffing. We increased the reservoir capacity from 1L to 1.5L without adding virtually any weight. We also cleaned up our manufacturing process making the pack stronger than ever. The DolfinPack V2 is the refined version of our award winning hydration pack.