Is the tumbler 40oz flip straw leak-proof?

We engineered our tumbler 40oz flip straw for complete leak-proof reliability:

• Magnetic Closure: The flip top seals with a secure magnetic click
• Silicone Gasket: Premium seal around the entire lid
• Straw Seal: The straw base is sealed to prevent leaks through the straw hole
• Tested Rigorously: Every tumbler 40oz flip straw passes shake, inversion, and pressure tests

Throw your tumbler 40oz flip straw in any bag with complete confidence—it will never leak.