There are essentially no options for a high-tech bag for big people. The Big Agnes Park series are special, not only because they are big, but because they are able to remove unnecessary weight & bulk where it is not needed (bottom of the bag). To keep weight low, try using a pad with reflective foil in it (Therm A Rest X-Therm, etc). The bags are not cheap, nor the X-Therm pads, but if you are backpacking AND want comfort, this is the setup. I have 9 BA bags and love them all. The zippers open & close very easily (they use YKK zippers). Once started, you can unzip the entire bag by GENTLY pulling the bag apart. Zipping up, the zipper may occasionally snag on the internal wind break (flap), but it is not as bad as with other bags. The pad pouch is great, so I don't roll off the pad. Most BA bags come with a heavy duty nylon stuff sack & an X-large cotton storage bag. A note on the temperature ratings... If you are hot-natured or are used to a cold environment, then BA's temperature ratings will probably be accurate for you (especially if you use an insulated pad like an X-Therm). I live in a moderate climate & are neither hot nor cold natured. Here are my comfort levels for different BA rated bags:
BA -15 with insulated pad = 0 to +15 degrees (most comfortable at +10).
BA 0 with insulated pad = +10 to +25 degrees (most comfortable at +20).
BA +15 with insulated pad = +20 to +35 degrees (most comfortable at +30).
BA +15 with non-insulated pad = +25 to +40 degrees (most comfort...
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