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An ultralight sleeping-bag decision is about the complete carried sleep system, not the smallest number on a bag listing. Set the temperature requirement and fit first, then compare where each design saves weight and what those savings ask you to give up.
Bag or quilt?
A quilt may omit the full enclosed back and depend more on how it is attached to the sleeping pad. An enclosed bag provides a different arrangement around the body and head. Inspect the actual design instead of treating a quilt as a universally better replacement. If you move a lot at night, think about whether the chosen attachment and edge arrangement will stay where you need it.
For a minimalist bag, examine zipper length, hood design and shoulder room. A shorter zipper may reduce weight but limit venting. A narrow cut is only useful if you can sleep comfortably in it.
Count the pieces you will carry
Include the pad, straps or attachment parts, any separate head insulation and storage sack in the comparison. A quilt's lower garment weight can be less impressive once the rest of the needed setup is included. For a bag, distinguish insulation fill weight from total carried weight.
REI's backpacking guide emphasizes matching temperature ratings when comparing weight. Do not compare a warmer bag to a fair-weather quilt without accounting for the different job.
Packed volume and care
High-fill-power down may be attractive for compact packing, but compare the finished product's rating and compressed volume. A high fill-power number alone cannot settle which complete setup is right. Plan to keep the insulation dry and read the care label before washing it.
Check whether repairs and replacement attachment parts are available for the model you choose. Ultralight gear still needs to be practical over repeated trips. No ranking here rests on measured field tests or an invented universal weight cutoff.
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