What is the meaning of Saddlebag?

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 motorcycle; often made of leather or (on a motorcycle) a rigid material.

pannier

A seat pack or a seat bag (a pouch or a small bag attached to the seat or seat post of a bicycle)

Loose fatty flesh on a person's upper thighs or buttocks, that hangs like saddlebags.

A style of house with two rooms separated by a small hall and open space.

Source: wiktionary.org