TETON Sports Altos Lightweight Mummy Sleeping Bag; Camping, Hiking, Backpacking

First and foremost, this is an excellent sleeping bag for the price. It's a very warm bag (perhaps too warm for all but the coldest nights) but it's also not excessively heavy or large. I purchased the bright orange bag rated for 0F (-18C) and the bag itself comes in at only 1295g (2.85lbs) and with the included compression bag the whole things is 1455g (3.2lbs). It packs up reasonably small for a 0F bag, but it's still a significant volume even when compressed. Pros: - Extremely warm bag - Packs up to a respectable size given the insulation value - Very light given the insulation value - Material feels soft and comfy, if not a little cheap - Very good neck baffle, and mummy top drawstring - Zippers are well baffled - Shape is snug but comfortable - Color is pretty cool Cons: - Zippers feel cheap. I wish they used a better quality zipper and charged an extra $10 - The bag is warmer and larger than most people will ever need, but it's their lightest bag - Zipper frequently snags inner baffle when closing - Drawstrings feel a bit cheap I find Teton's ratings and weights to be incredibly confusing, and there are several nearly identical looking products spanning the $99 up to $300 price points all with pretty non-sensical weights listed, with significant discrepancies between their website and Amazon. This matters a lot for those backpacking and looking for a lightweight sleeping bag, so having unreliable numbers there isn't great. Finally, I wish Teton would make a truly ultralight and compact 30-40F bag using the same general construction as their 0F bag, but with less insulation. There is a lack of good options for simple fall camping where a bag like this one is really too warm, and as a result, larger and heavier than needed. If they could make a bag like that at this price point, I would buy it in a heartbeat.

Long term review: I am writing this review 5 years after my original purchase, over which time I have used this for 2-4 weeks per year. The sleeping bag has been fantastic. It is still going strong without any major issues. The zips have held up well and the synthetic down remains warm as ever. I have no complaints about this bag and it has seen me through camping and hiking in all conditions. It's very warm, which is great if you run cold, but is sometimes too hot for summer camping in Australia (often I will use it unzipped or half on me for warmer nights). It's long enough for my height of 6 ft and I enjoy the cozy mummy shape, although I've had friends who find the tight leg space uncomfortable.

Sleeping bag looks great but the cover bag is just too bulky and a bit heavy, not that good design, so inconvenient for putting it in the backpack!!

Muy calientito y ligero, totalmente recomendable si acampas en alta montaña

This sleeping bag is comfortable enough but does not provide the amount of warmth I was hoping for. I'll start with the negative being that warmth seeps out of this bag. Despite my best attempts at closing in the opening, without anything else to slow the temperature drop, it's going to get uncomfortable. If you move in your sleep, you'll get colder quicker. The good news is it'll keep you alive until the sun, movement, and coffee in the morning can reheat you. It is imperative that you put boiling water in a Nalgene bottle to stuff in this bag for overnight so you can get a decent night's rest. I've also had to put on toe warmers in my camp booties to keep my feet from being the reason I wake up in the night. The positive is that this is a great price for the weather rating. I look forward to using it for weather over 32F as we transition into the late spring/summer months. It has great compression and is perfectly lightweight. I stuff it in my backpack without the stuff sack as the buckles are too bulky and with a few good shoves from the top, I manage to fit a plethora of other kit in my pack. It will remain a staple in my backpack for the fall and spring seasons.