Roomy cut and yet a very warm bag- it lofts up huge. The provided stuff sack is too small for a long bag. Yes, it will fit, but it's too much of a struggle for me to save an inch or two of space. I replaced the stuff sack with a slightly larger sil-nylon sack. The long bag weighs exactly 3 lbs; 3 lbs 1 oz in my sil-nylon sack. It should have a velcro connection on the draft collar: why omit this this? this helps keep in warmth and helps with comfort and fit. I can't see leaving this feature out on a 0 degree $500 bag. It has a full length zipper which tends to hang. I could also deal with a slightly smaller cut above the waist to make it even lighter and warmer- I'm 6' ~165 lbs and have lots of space. Pricey but worth it.

I tested out this awesome bag a few nights ago at around about 10,260 feet. When the sun goes away the temperature always drops, and the mountains become cold here in Colorado. There is no escaping that reality if you want to sleep high. The lithium is just the ticket. The only problem I have found if you want to call it a problem is that I slept too deep. Bears could have been stealing my food and I would not have cared. Maybe it was just the Lithium, who knows. I dare anybody to find a better bag. Full zipper rocks now so you don't overheat and possibly sweat. But even if you do sweat the bag seemed to cooperate correctly with that issue amazingly well. Just be sure to wear capilene or have a wicking liner inside and the imperfections of mountain sleeping can simply vanish into smokey thin air. Mostly smokey because of the California wild fires.

Lithium is a great bag bot if i were in Canada in a life or death situation there is no equal to the Puma! Beth thought i had someone sleeping with me the loft is incredible!!!! will

love my new bag. Used it a few weekends ago in 0' weather and slept very well. Very warm and soft.

The first outing with my new Lithium 0 degree bag was in the Gila Wilderness days after the bag arrived. Roomy, cozy and comfortable down to 16F one night, slightly warmer on the others. One night on my usual nocturnal outing, climbing back into the bag and trying to zip up, I had trouble with the zipper grabbing a lot of shell and causing some temporary frustration. Extra care in zipping back up avoided the problem the rest of the trip.
On down bags, I always replace the standard issue stuff sack with a waterproof stuff sack and so did not experience the difficulties mentioned above. All in all, a fine product.

I'd agree, the stuffsack isn't great, but I'd planned on getting a waterproof construction sack anyway. The bag itself is amazing, very warm and comfortable. I'm 6'5", 235 lbs. and I had no problem fitting into the long bag.

I just got My Lithium out of the box around 15 minutes ago and Im completely sold. It fluffed up immediately. I can tell the temperature rating is true. More amazing is the way the full collar cinches up automatically when you zip up all the way. No fumbling around with velcro. The down baffle literally pushes itself up against the hood making a more then plush seal. The down seems plentiful in this bag and I am not too worried about losing loft in the future. But only time will tell with that one. This bag is not the lightest of them all, but it seems it will be worth every ounce of weight. If I have anything bad to say about this bag I will write another review, but otherwise I can see no flaws. I think my expectations will be met with this bag for sure.

On my first trip with the lithium, the stuffsack broke at the drawcord. Maybe the fabric in the stuffsack is to thin.