Used twice. Camelbak Octane Dart Hydration Pack with 50 oz bladder. Black pack with blue bladder. Ships quickly from smoke-free home. Minimalist design, maximum comfort. When a handheld just isn't enough, but an ultra running vest feels like overkill, the Dart is your streamlined companion. The Dart has been a favorite among runners for years, thanks to its simple and intuitive features: a zippered essentials pocket in the back, and a stretchy pocket on the harness for gels or bars.