The Sierra Designs Zissou 23 sleeping bag is the bag I’ve been using regularly for the past year and half. I picked this up at a considerable discount at REI without doing much research, and since, have gotten a chance to know the bag very well. The main feature that attracted me to the bag was a combination of warmth and weight. I tend to run hot, so a bag with a 23 rating is fine for me down to around 10 degrees. I used this bag in Peru last year, and on the Ausangate trek, I spent a few nights in single digits without being too uncomfortable. I’d say the ideal range for me on this bag is 10 degrees up to about 65 degrees. I used this bag on a few summer overnighters, and even unzipped, was sweating quite a bit. The weight for this bag is also very nice at 2 lbs. It fits nicely into my pack without weighing me down.
The insulation on this pack is DriDown, which is a down that is resistant to water. I haven’t had the misfortune of getting this bag wet, so I can’t say if it really does dry faster than other insulators like advertised. I do know that it stays warm in humid and moist conditions, even when waking up in a tent full of condensation in the humid forests of Peru. When humid and moist, the bag seemed to be dry by the time we were back in a dry climate.
The stitching on the bag does a good job of keeping the down in place, as I haven’t noticed a huge decrease in loft, or any cold spots. One of the marketing lines of this bag focuses on it having a snag-free zipper, I have not found this to be the case. The zipper tends to snag quite a bit, so I tend to use caution when getting in and out. It’s not so fun on really cold nights when my fingers are encumbered by gloves, so I take a few points off for this. I do like the small zipper pouch by the head zip, as it allows me to store small items I may need in the middle of the night.
Sleeping bags are always a tough fit for my body, as I have wide shoulders. This bag is no different, and when fully zipped, I feel locked in very snugly. I don’t take any points off for this, as it’s a function of my body and not the bag.
Overall, I would recommend this bag to those looking for something lightweight, warm, and affordable. It’s a good combination when combining these things. There are probably better bags out there, but for the price I got at REI, I’m very happy with the purchase.