Backpackers who value comfort in camp over weight on your back loved the Lost Lake. Though it was the heaviest in this class, a few extra ounces in trail weight translated to some added comfort in camp—and less stress on the wallet.

Compressibility
The 700-fill down and light nylon shell packed somewhat loosely into an 8×17 stuff sack (about the size of a rugby ball). Compression of that sack took the bag down to about the size of a small football. That’s plenty small enough for moderate weekend or even fast-pack overnight backpacks.

Warmth-to-weight ratio
Our testers deemed the Lost Lake the warmest bag with the greatest comfort range in this class. The vertical baffles utilized by Big Agnes proved effective in helping regulate heat from body core to feet. A sizeable draft sleeve and collar effectively sealed heat in, and cold night air out. We found ourselves truly comfortable in the bag during nights hovering around freezing. Unfortunately, the bag’s weight kept the warmth-to-weight ratio in the middle ranks.

Comfort
The traditional design of the Lost Lake includes a full-length zipper, making it a touch heavier then some of its competitors but also more comfortable and versatile. The longer zipper made it easier to slip in and out, and when the nights warmed up, it allowed sleepers to increase ventilation in the legs to better regulate temperatures.

The cut of the bag was less generous than the Sierra Designs Cal, but only the broadest-shouldered campers–and the most restless sleepers–deemed the fit too snug.

Durability
The only issue we encountered in durability was a modest tendency for the zipper to snag on the bag’s lining. A modicum of care while closing the bag eliminates this concern, however.