Light and Capable
I bought this sleeping bag for my daughter who is a camp counselor in Central Indiana during the summer months. The cabins are not air conditioned and sleeping on hot days can be difficult. The summer temperature extremes made bedding for challenging for her. So far this bag is working out well. It is super light, stuffs into a very small space and is roomy enough for my daughter in her bunk. It does a nice job of wicking away perspiration and of keeping her comfortable on cool nights. Don't buy the bag to camp in the winter, but it's a great summer backpack bag for applications like ours or for canoeing in the BWCWA.

Good bag for summer trips. Light enough for long backpacking trips. Dissent compression size. I am 5.6 170lb . The bag fits me well with ample space in the shoulders. Last weekend I used it on the fishing trip. We slept in the tent on the cots. The temperature outside was 45F. It provided me with comfortable warmth.

Good Value
I also have the Mountain Hardwear Phantom 45 degree bag. The Phantom is a great bag with 800 down fill and weights in at 1 lb 3 oz. I have the older style were the zipper does not go all the way down to the foot. This does not work well when it is warm. You are not able to unzip all the way to keep vent. Bad design. So I just purchased the Sunrise 50 for half the price of the Phantom. It only weights 2oz more and has a full zipper, which I think you need in a summer bag. Packs just as small as the Phantom. I wish the Sunrise had the "Superlight 15D Ripstop" shell material. The Phantom seems to have more loft with the 800 down vs the 600 fill in the Sunrise. But other then that I think the Sunrise is a great bag for summer camping. Haven't used it yet, but I have high hopes it will replace the Phantom. I used the Phantom last spring at Lake Placid, summer on Mt Massive in Colorado, and summer camping on the sailboat. It kept me warm, but sometimes to warm. I will also use this bag for travel with inside sleeping(huts & friend's couches).

Great for traveling
I bought this sleeping bag to take on international trips for those times when sleeping arrangements are less than ideal. I'm always cold and it has worked very well for me indoors. I'm hoping to take it camping in the summer but I would not bring it anywhere the temp was supposed to drop below 50F. It packs down to slightly larger than a nalgene and comes with a mesh sack for storage. To get one much smaller or lighter you would need to spend 2-3x more money so I find this to be a great buy. I can't speak to the long-term durability yet but it looks well made. My boyfriend borrowed it and liked it so much we are buying a second one!