Unfortunately I predate those! I would love to get my hands one of those.I still have my Army Modular Sleep System and it is awesome. Keeps you warm down to -40 with all 3 bags together, and on sale at Midway USA for 69.00 right now. They are surplus bags but Midway is a great site and their stuff is always excellent. www.midwayusa.com. Definitely check out Military Surplus stores as well, or search online for the system. It really works very well and is worth the 69.00 or even the 99.00 when not on sale. I have slept in the bag in the mountains for training at temps down to minus 15 and was toasty warm.
Check out the website I quoted above, they had them on sale for 69.00, or 66.00 I forget, but one of those. A really good deal for what you are getting. You can search for them online as well and find people or auctions who are selling them.Unfortunately I predate those! I would love to get my hands one of those.