A pack saddle is any device designed to be secured on the back of a horse, mule, or other working animal so it can carry heavy loads such as luggage, firewood, small cannons or other weapons too heavy to be carried by humans.
Ideally the pack saddle rests on a saddle blanket or saddle pad to spread the weight of the saddle and its burden on the pack animal's back. The underside of the pack saddle is designed to conform well to the shape of the pack animal's back. It is typically divided into two symmetrical parts separated by a gap at the top to ensure that the weight being carried does not rest on the draft animal's backbone and to provide good ventilation to promote the evaporation of sweat.
The pack saddle consists of a tree, or the wooden blocks that sit on the horse's back, the half breed which is the canvas saddle cover, the breeching and often a crupper which prevents the loaded saddle from sliding too far forward and the breast collar which holds the loaded saddle from sliding too far back on the packhorse or mule. The flexible bars on this packsaddle adjust to a horse's back and offer several options for hanging panniers.
You used to live in New York City
Then you moved to L.A.
But you still miss the streets
Where you used to play
So you hurry on back there
(Even) Leave your pool and your car
Only to find you no longer belong
Fool don't you know what you are
Hit the streets at midnight
Still dancing after dawn
But something seems to be missing
Just what are you running from
Do you like your love in the dark
Or laid out in the sun
When you just can't make up your mind
Don't you know what you've become
Bi-coastal, miss the natural speed of the city
Bi-coastal, California's fine if you're pretty
Bi-coastal, when both are so much fun
Why do you have to pick one
You can always hear me singing
Oh say can you see
From the towers of Manhattan
To the hills of Beverly
All those girls in TV movies
All those boys on Broadway
When you can't make up your mind
You know you'd go either way
Bi-coastal, miss the natural speed of the city
Bi-coastal, California's fine if you're pretty
Bi-coastal, when both are so much fun
Why do you have to pick one