Check the REI Sub-Kilo bag, it's often on sale for less than $200, and otherwise meets your specs.

We still have an original Mountain Hardwear Phantom bag, rated to 32-F and only 21 ounces. It's a size regular -- theoretically fits to six feet even. I might could be persuaded to part with it. (My wife has since moved on to a Western Mountaineering Ultralite Super.)
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--Ken B