pannier vs saddlebag

pannier

noun
  • A large basket or bag fastened, usually in pairs, to the back of a bicycle or pack animal, or carried in pairs over the shoulders. 

  • One of a pair of hoops used to expand the volume of a woman's skirt to either side. 

  • A breadbasket. 

  • A piece of basketwork for protecting archers, or, filled with gravel or sand, for forming and protecting embankments, etc. 

  • A decorative basket for the display of flowers or fruits. 

saddlebag

noun
  • 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. 

  • 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. 

How often have the words pannier and saddlebag occurred in a corpus of books? (source: Google Ngram Viewer )