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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.
The cap is plastic, but the bottle is stainless.
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.
It is plastic on the inside of the cap.
The cap is plastic the inside body is stainless
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