Special leather covers are sold for the Trezor, they certainly increase its mechanical strength, but still, in terms of strength, it loses much to the yubikey. And i think even if the Trezor will is in a leather case and someone weighing over 200 pounds steps on it with their heels, not even a leather case will help him.
In terms of mechanical strength Yubikey 5 USB-A has the linchpin. When you plug the key horizontally into USB port and accidentally push it down with force while touching golden plate it bends and may break down. To prevent this I plug it only vertically and touch it on both sides so as not to bend
