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I just bought this one on sale on Amazon. It's well made and very water resistant, but not waterproof. Also, if you're tall, over 6 feet, the strap is probably too short.

I paid 16 bucks for it....

I was looking at the Orvis sling pack. I was impressed, especially because it's waterproof. I needed more room, however, so I bought their backpack.

Of course I also love my Simms waterproof fanny...