Does anyone know why my Stanley thermos has this second set of threads? I can't find any reason online or a larger cup that I could order for it. I love this

BUT WHY JUST WHY : r/YouniquePresenterMS

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Does anyone know why my Stanley thermos has this second set of threads? I can't find any reason online or a larger cup that I could order for it. I love this

Best Thermos of 2024

I had to work retail for a few months. Stanley cups make me sick. : r/Anticonsumption

Old Stanley Vs New Stanley

Testing a replacement Stanley Thermos : r/BuyItForLife