What's with the wild price difference in sleeping bags?

[Moonliner]

Originally Posted by Betty

Sleeping bags - $30 - over $130 for what appears to be the same sleeping device - often rated with the same degree range. Why is there such a big price difference?

Can the fabric/zipper be that much better?

I'm in the market to buy a new sleeping bag - a large/tall style that's pretty warm. We don't backpack so weight is not my main concern.

What's been your experience if you bought a higher priced sleeping bag? Do you think it was worth it?

I think the key is often weight. Bags with the same temperature rating can vary greatly in price due to weight.