Fluggepäck-zugelassene Mystique Fashion Pet Carrier, Stil LJ0W

Flew with my cat last month and this slid right under the seat without a fight from the gate agent. The shoulder strap actually stays put on my shoulder, which I didn't expect from a carrier this light. She napped the whole flight, so I'm calling it a win.

The double zippers on the top mesh are a small thing but they make such a difference — my cat can poke his head out without me worrying he'll pop the whole thing open. The shoulder strap sat comfortably through a long airport walk, and he actually napped most of the way.

Took my cat on a four-hour flight last week and she actually slept most of the way. The shoulder strap didn't dig in, and the hand bag strap was a nice backup while boarding. Getting her in and out was easy thanks to those mesh zippers on top.