Are the stainless steel blender bottles microwave safe?

Strongly discouraged

While the plastics used in BlenderBottle® brand products are BPA- and Phthalate-free, microwaving is strongly discouraged. The leak-proof seal can allow pressure to build up inside the bottle/jars when heating, causing the lids or flip caps to open unexpectedly and spray contents. Never microwave the BlenderBottle® with the BlenderBall® inside.

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