Handmande by Lithuania's StudioImpossibilis, this leather bicycle bag fits into the V-shaped opening in the center of most bicycles. It's leakproof and durable, and weathering just makes it look better. Contact seller for size specs.
Bought WalnutStudiolo's leather handlebar wraps for my brother one year. Geoff at this lovely Portland-based shop never ceases to impress me! (http://www.etsy.com/shop/WalnutStudiolo?ref=pr_shop Handstitched leather bike accessories + more)