SlumberSystems is no longer in business, and the 900 has been discontinued. If you're looking for something new, check out the best cold weather sleeping bags for 2020.
Reviewers Paid: $400.00
I am a cold weather man, and this sleeping bag is the best I have used yet for the price. The thing almost seems to inflate on removal from its sack! Very warm, durable and well designed, it would take a lot for me to use anything else. Just shows what small specialist companies can do.
Fill: Exel Dry Down
Temperature Rating: Extreme -28C
Price Paid: Approx $400 USD