Reserve Tank. OSHA says you should drink a cup of water every 15 minutes when working in hot weather. Easier said than done — unless you're wearing a Camelbak Hi-Viz hydration system. Designed for construction and other industrial uses, the Hi-Viz holds two liters of water and features a tear-away harness to prevent entanglement accidents. It comes in orange and lime green and sells for about $50. Camelbak, 800/767-8725.

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