No need for a sleeping bag
I used this with a sheet/silk sleeping bag on a 4 month bike tour of South America. Except when the temperature dropped to below zero where I used a sleeping bag I used this as a duvet and was kept warm. It also packs away to almost nothing and weights very little. The smaller version is quite narrow and I prefer this wider one. Especially if you are sharing the tent with a partner. It is now my blanket in the living room on a cold winters night when I am not touring. great piece of kit.