How do you recommend to use the Tumbler when filled with boiling hot liquids?

When filling the Tumbler with boiling hot liquids, some steam can build up within it which may cause the lid to pop off.

We would therefore recommend to keep a very small amount of the sipping-hole open in order to allow any excess pressure to escape.

We would also not recommend using the stainless steel straw with boiling hot liquids because it can heat up a lot.

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