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Generation two of Black Diamond's Distance 4L Hydration Vest takes us even further, thanks to the new stretchy and supportive construction. The running harness-style suspension system stretches from the sides across the back panel to offer comfort during training sessions, races, and fast-paced hikes. The stretch side panels provide a secure fit, and the integrated trekking pole carry loops keep Black Diamond Z-Poles fastened across our back to free our hands for scrambling. Front pockets stash the included soft flasks for on-the-go hydration, the pass-through lumbar pocket provides storage for an extra layer, and an abundance of other stretch and zippered pockets keep all our on-trail essentials within reach.