Is the cap stainless steel on the inside? I like to flavor my water with essential oil. Essential oil and plastic don't mix well together.

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Is the cap stainless steel on the inside? I like to flavor my water with essential oil. Essential oil and plastic don’t mix well together.

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The Cap is not stainless steel on the inside. You could put the oil on the inside rim of the thermos. The cap doesn’t touch that.

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It is plastic on the inside of the cap.

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The cap is plastic the inside body is stainless

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The cap is plastic, but the bottle is stainless.

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