Answer:
What stays the same size no matter how much they weight?
A doctor might remove one from the neck of a Dracula victim.
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see.
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. The wind is my lover, one-ยญlegged am I. Name me and see me at home in the sky.
When they are caught, they are thrown away. When they escape, you itch all day.
If itโs information you seek, come and see me. If itโs pairs of letters you need, I have consecutively three. What am I?