Yes, you are fully permitted to take your diabetes kit on a plane in 2026, as medical supplies and equipment are exempt from the standard TSA "3-1-1" liquid restrictions. You can bring unlimited amounts of insulin (vials or pens), syringes, lancets, and blood glucose meters in your carry-on luggage. It is highly recommended to never pack these items in a checked bag, as cargo holds can experience extreme temperatures that may damage your insulin or CGM sensors. When going through security, you should notify the TSA officer that you are carrying medically necessary supplies. If you wear an insulin pump or a Continuous Glucose Monitor (CGM), you can request a manual pat-down or a hand-wand screening instead of going through the 3D body scanner or X-ray machine, as some manufacturers still warn that intense radiation can interfere with the device's electronics. For a smoother experience, keep your medications in their original pharmacy-labeled packaging and consider carrying a printed copy of your prescription to clarify any questions during the screening process.