India, Feb. 11 -- After nearly 12 years as a flight attendant, I feel like I've seen just about everything. Unruly passengers barely register anymore, but truly efficient travelers always do. They board calmly and prepared, slide seamlessly into their seats, and settle in without breaking a sweat.

From the front of the plane, it's easy to spot where trips go sideways: overstuffed vintage luggage, items better suited for a bedroom than seat 12B, and habits that quietly add stress before the plane even leaves the gate. The good news? Most of it is fixable. Ahead are 12 items to never bring on a flight, along with smart swaps that will make your next trip smoother, easier, and far more relaxing.

Flight Attendant-approved Travel Essentials...