The vest itself is surprisingly heavy (compared to my MH 6-liter hydration pack at 5 oz) and is going to be warm on a hot day. Once the many adjustment points are dialed in, the pack carries a 7- to 8-pound load without bouncing or swaying while running at a 5 to 6 mi/hr pace. Sizing was tricky for me. At 5'7" and 142 lbs, I found that the M/L was too large even with the pack full and everything cinched down to the limit. Conversely, the S/M was small and barely fits with the sternum straps extended to their limit with only a tech shirt underneath. Note that the claimed weight of 15.5 oz is fo...
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