Comments about Coghlan's Coghlan's Leather Bota Bag:
If you're reading this, you're probably like me. You don't want another "mee-too" nalgene bottle. This has the style you're looking for. I bought this to fill with wine for a car camping trip, but it could easily be used with water for a backpacking trip. It has a liner, so the leather isn't going to taint your water. The leather is real, and suede, and has a cool "made in spain" mark on it.
It has a small opening, about the size of a 20oz bottle so it probably won't be easy to clean.