Niederländischer Modularer Schlafsackliner mit Reißverschluss, Überschuss

A liner bag which you stuff inside the actual sleeping bag to spare it from washing. Used.

Just like a mummy-type sleeping bag, but made of thin cotton. Can be attached inside the Dutch modular bags but will work with any sleeping bag, just throw it in. Of course, if you want to take it further, sew on a couple of cloth strips to your sleeping bag and you can have this securely attached.

The Medium size is suitable for average-sized men and the Large one for taller people up to around 190 cm / 6' 3". The X-Large goes

Dutch army surplus

Used, washed, and serviceable. Many even looked unissued.