Saddlebags

noun

1. A covered pouch, usually one of a pair, laid across the back of a horse, donkey, or mule behind its saddle, or hanging over the rear wheel of a bicycle or motorcycle; often made of leather or (on a bicycle or motorcycle) a rigid material.
2. (in the plural) Loose fatty flesh on a person's upper thighs or buttocks, that hangs like saddlebags.
3. A style of house with two rooms separated by a small hall and open space.