I have been lucky enough to have been accquired two of these over the years. This was a special pattern of pack only issued to the Home Guard. The Home Guard had several items of kit unique to them. Of very simple design and construction and made from a water proof rubberised canvas material. These are now getting hard to find in good condition.
The one I show here is dated 1940 and maker marked for the "Pioneer Rubber Company Manchester" The interior is divided into two compartments.