This thing makes the Nalgene wide-mouth the best water bottle I've ever used

I thought it was the wrong size for my Nalgene wide-mouth, but it fits absolutely perfectly. This thing makes the Nalgene wide-mouth the best water bottle I've ever used. I like putting ice in my drinks but hate when the ice clogs the opening, but this prevents it. Also, the large hole on the rear wall is for the air to escape so you get a nice smooth flow of water.

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