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CamelBak built the Circuit Hydration Vest for minimalist runners who don't want a big pack cramping their stride. The Circuit keeps things light while the sternum and side straps keep the pack secure as we push for our PR or enjoy the satisfaction and endorphins of our regular training runs. We like the versatility of carrying our water on our back or up front--with either the 1. 5 liter Crux reservoir or the convenient front pockets for our flasks or small water bottles. We also like the ventilated mesh to keep us cooler on hot runs--plus the sweat-proof pocket for electronics, key clip, and extra storage for snacks and energy gels.