The cap doesn't stay closed!

I've used and loved NATHAN water bottles for years, I probably owned 5 or 6. I ordered this smaller size to use at the gym, but the cap seemed to pop off for no reason. I ordered a replacement, which seemed better at first, but the same happened after only 2 weeks of usage - resulting in water leaking into the seats of my car. Really upset the quality has become so terrible. Onto the next brand.

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