Two of these were sent to me. Both had the same problem. The clip has a stress crack/mark from the stretched plastic. This is a design flaw as at this point it is not strong enough to withstand the force the clamping system exerts on it to keep the top closed. Both of them felt that tension at once. boxing I have not used this growler yet. I returned both. Hoping for a spell for the third time. I called Stanley customer service and was told that this is a common problem after some use but that if they find it new they should return it. They also said it had a lifetime warranty and if it broke it would be fixed. Of course I would have to pay for shipping. The second growler also had a tension ring to attach this clip around the neck. See photos. (Last 3 photos from first return) 2/28/17 Just received my third growler. This puts the same tension on the terminal. The color changes from green to white/light green as the plastic tears from stress. I think the design flaw is worse than I thought. Shame on Stanley for releasing this with such an obvious design issue. The transition in the right corner (damage zone) should be more slanted and not so perpendicular, this spreads the stress over a large area. Added more photos.
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