I'd be very leary of this bag.
The brand, Neus Trading, isn't shown on any of the standard backpack gear sites I checked.
Off brands are notorious for wild-a$$ed claims about temperature. There are neither government nor industry standards for sleeping bag temperature ratings. One manufacturer's 20 degree bag would be rated -10 degrees by another.
Go with a quality bag, made by a quality manufacturer. To save money, look at the discount outdoor retail websites, such as www.rei-outlet.com or www.sierratradingpost.com.
A quick illustration. My father purchased at $100 down sleeping bag for me when I was Scout in the late 60s. That was a lot of money, but that bag always kept me warm, even in a blizzard at Donner Lake in the Sierra Nevadas. It also kept my son warm in his early Scouting career. We just retired it to "sleep over" duty, two years ago. Because it was a high quality bag, it was a tremendous bargain in terms of cost per nights of comfortable sleep.
If I can plug my Troop's website, check out the Scoutmaster Gear Tips at www.scouttroop14.org.
- Oren Noah