Can you take a Yeti on an airplane? Yes. The drinkware is treated the same as any bottle or thermos by TSA. You just can't fill it until after you've passed security.

Yes, you can definitely take a Yeti Cup (or any insulated stainless steel tumbler) on an airplane, provided it is empty when you pass through the security checkpoint. The "double-wall vacuum insulation" of a Yeti cup does not interfere with X-ray scanners, and it is perfectly legal to carry in your hand or stow in your personal item. The "hack" used by many frequent travelers in 2026 is to bring the empty Yeti through security and then fill it at a "Water Refill Station" or a coffee shop inside the terminal. This allows you to have a cold or hot beverage at the gate and on the plane that stays at temperature much longer than the airline's plastic cups. If you are using it for coffee, ensure the lid is spill-proof, as turbulence can be unpredictable. One minor note: because of the thick metal walls, the TSA may occasionally pull your bag for a "secondary search" just to verify the cup is empty, so it's often best to place it in a bin or at the top of your bag to show the lid is off and there is no liquid inside.