Leather protector spray for a jacket?

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I'm considering buying a leather jacket and been reading online that I should spray it to protect it from water damage.

Can anyone recommend one that they have used?
I'm nervous about it as I would be spending about 400 pounds on the jacket.
 
I love this one I use it on everything

 
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I love this one I use it on everything

I see it comes in a few sizes - Would the 125ml be enough for a ladies leather jacket?