The Velocity IT 1.5L features our new IsoBound insulation technology that keeps water cold and won’t sweat in warm temperatures. Engineered to keep fluids at an ideal temperature 38% longer than a standard reservoir. After all, cold water is more refreshing.
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Sierra Designs Backcountry Bivy 3000 
Darn Tough Mountaineering Micro Crew Heavyweight with Full Cushion Socks 