What is "feedbags"

Usage examples of "feedbags".

Lord Primus, when they stopped to feed the horses feedbags of damp oats.

The horses, the mighty mounts who would serve as their vehicles of battle in the upcoming joust, munched contentedly on their feedbags, watching the pageantry with bored eyes.

The moment the mounts had strapped on the feedbags that morning, it was the equivalent of bellying up to the bar.