I use Nalgene 48 oz. Bunker for my workout at our local BJJ/Muay Thai gym. Before I bought the Humangear Cap, I drank from a wide-necked bottle. We take short breaks to drink water and then return to the mat. A few quick sips of water usually resulted in me spilling water all over myself when I was in a hurry. With the Humangear cap I unscrew it, swallow as much water as I want in a controlled manner, put it back on and return to the instructor. I love this item and wish I had bought it sooner!
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