Translation guide
A warm, padded bag for sleeping in, especially outdoors.
The common item used for camping or sleepovers.
The standard word for a sleeping bag. Literally 'sleeping bag'.
寝袋を持ってキャンプに行った。
I took my sleeping bag and went camping.
この寝袋はとても暖かい。
This sleeping bag is very warm.
Borrowed from German 'Schlafsack'. Common among outdoor enthusiasts, but less everyday than 寝袋.
Please tell me how to choose a sleeping bag.