I recently picked up a pack at a collector show that I cannot identify. The material for the main body appears to be similar to that used to construct bags for carrying the light respirator. All of the webbing and hardware seems to be British manufacture. There are no markings anyway on the pack. A fellow collector friend I showed it to thinks that it may be post Second World War and made for commerical use using surplus materials on hand. As this is the first of its kind I have ever seen and it does not appear in any of my research materials, I figured I would put it out here for discussion. Regardless, it was cheap enough money to take the risk on and has turned ou to be a great pack to wear when driving my Royal Enfield to work!
Additonal photos can be seen at: