User Review: Slumberjack Super Guide +30°F
Temperature Rating: 30F
Price Paid: $65
It's amazing to see reviewers not properly use a sleeping bag. Do not expect to be warm inside a bag with clothes on. Get in with as little clothes on as you can, wear a hat. Your body will heat up the bag. Use a sleeping pad.
As far as the bag itself. It's designed for backpacking, period. Anyone who is a backpacker knows there is a trade-off of weight versus performance for certain equipment. It will borderline at 30F, it will keep you asleep, but you won't be super warm. For the price vs weight and space... this bag is almost impossible to beat.