Plastic in water concern with PRIMO 5-gallon exchange bottles

I have a Primo top-loading cooler and 5-gallon bottles. I exchange them at a local walmart. Every time I put a new bottle on my top-loading cooler, I think to myself how much of the plastic seal is breaking into the water and I'm drinking plastic. How concern should I be? Anyone know what is this made of? I can’t anything on primo site.

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