While not leather, I would highly suggest T-bags. They come at a premium but they are well built. If you prefer leather, check out river road. The few items I've gotten from them were also top notch. The cheaper ones I've seen are just that - cheap .
I use a T-bag stowaway. I don't keep it on the bike for fear of theft but it holds a weeks worth of clothes. The included rain cover did its job thru about an hour of rain last year.
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