Other forms: saddlebags
A saddlebag is a bag hung from the back of a saddle. Pack the saddlebags, a leather saddlebag, empty the saddlebag.
They hang in pairs so the weight balances, which matters as much on a bicycle as on a horse. The word is also used unkindly for fat carried on the outer thighs, which is a modern and unwelcome extension.
1nounsaddlebagA bag hung from the back of a saddle.
“He took a water bottle from his saddlebag and let the horse rest.”
saddlebag is a bag.
Saddle plus bag. Saddle is Old English sadol, from a Germanic root.
From saddle + bag.
Etymology from Wiktionary, CC BY-SA