Thermo flask - wall - air pressure

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SUMMARY

A thermo flask operates by creating a vacuum between its outer and inner walls, which prevents heat transfer. The air pressure outside the flask exerts force on the outer wall, but the structural integrity of the walls is sufficient to withstand this pressure without bending. This design effectively maintains the temperature of the contents inside the flask, demonstrating the principles of thermodynamics and material strength.

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anandzoom
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In a thermo flask the air between the outer and under wall is sucked out and a vacuum is created. So the air pressure should push the outer wall towards the inner wall and vice versa. But it doesn't happen. Why?
 
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The walls are strong enough to withstand the pressure and therefor don't bend.
 
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