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While taking a new look at the bags I noticed some new closing systems:
http://www.zpacks.com/quilts/sleepingbag.shtml

It looks like a fairly lightweight zipper:

Zipper weight for different sleeping bag lenghts:
Short: .5 ounces (14 grams)
Regular, Long: .6 ounces (17 grams)


Comparing the weight: I think...

Makes you wonder if there's some other way of closing the backside. Aren't there other quilts with no back zipper and just straps to hold the pad? Having the zipper on top is probably not a good idea...

I'll save 700 grams / 25 oz. and considerable volume. While at the same time getting a much warmer bag. Everyone's happy except my bank account. :)

I'm looking at top quilts and found this sleeping bag/quilt from ZPacks.

For the temperature rating, they are pretty light (compared to other top quilts I've been looking at), and having the...