Saddlebag (noun)

1. A bag, usually made of leather or fabric, that is attached to a horse's saddle and used for carrying items.
2. A bag, usually made of leather or fabric, that is designed to be worn over the shoulder and used for carrying items.

Origin:

From the middle english word "sadelbagge" meaning a bag for carrying things on a horse"s saddle.

Examples:

1. The cowboy filled his saddlebags with supplies for the long ride ahead.
2. I always keep my wallet and keys in my saddlebag when I'm out for a bike ride.
3. The messenger bag she carried was often mistaken for a saddlebag.
4. The backpacker had a small saddlebag attached to his backpack.
5. The saddlebag is a convenient way to carry your items while horseback riding.