This bag has been great! Although it is a little bulky in size, it's very warm and comfortable. I would recomend this bag to any couple that does light camping.

The Teton Sports Mammoth 0-Degree sleeping bag is a great over-size bag for the money. The quality of construction is great, and when I used it in 35 degree F temperatures with another person it is very comfortable (in the desert, not sure how well it will perform in a humid environment). The bag also comes in a very well built sack with adjusting straps.
The picture on Amazon of it with three people in it however is a little misleading, in that picture it truly appears massive, but I would say two adults fit well in it, but adding any more bodies than that may get crowded. Also, I am 6'-4" feet tall and I would say this bag will be long enough for someone as tall as 6'-7".

I hesitated buying this sleeping bag due to the price, but my boyfriend insisted on it. We went camping with it this past weekend, and the temperature was around 50 or mid-40's (we were on a beach in southern California), so we didn't exactly test it in extreme temperatures. It was so warm and cozy and definitely kept us warmer than our cheap sleeping bags would have. Actually it was so warm we had to open the sides a little to let air in! Having slept uncomfortably cold nights in a cheap sleeping bag before, this sleeping bag is worth the price for the good night's sleep alone. On our second night camping, it rained pretty hard and we realized our tent was leaking. We patched it with some tape and trash bags, but the inside of the tent was fairly wet. The outer material of the sleeping bag appears to be waterproof, so we were still pretty warm the whole night even though it got a little wet (we brought a spare sleeping bag to pad under the Teton - it was soaked). Now we just need a good tent to go with our awesome sleeping bag!

I do a lot of camping in very cold weather and I'm not exactly a tiny person. Neither is my husband. We both fit in this tent very comfortably being the size we are and in 22 degree weather we were VERY warm in this sleeping bag. It was well worth what we paid for it and then some. Before we got this sleeping bag, we didn't sleep well camping because it would be so cold we would shake all night, but this time other people came out of their tents saying they didn't get a good nights sleep because it was too cold. And we got good sleep!

So, this sleeping bag is wide enough for bigger folk (200+) and warm enough for REALLY cold weather.

Another cool feature it has is this piece that you can pull over your face and head if you want to, and it has this slight indention to where you can still breath, or tunnel as I call it. So your nose and mouth doesn't freeze.

This is a great sleeping bag if you don't mind the size and weight of it when it's packed up.

My husband and I fit comfortably in it with room to toss and turn. My son had room to slide in too for story time or morning cuddles.

I haven't tested it in really cold weather, so I can't attest to that point, but overall it was really soft and comfy and we love it!