The Assault 24 Hours Ration (A) box, made to the original specifications and copied from an original.
They were designed to fit inside the small mess tin, and was issued with the 24 Hour Ration Tin, the latter fitting inside the large mess tin.
The box contains the instructions label, as per the originals.
Assault 24 Hour Ration (A) Box
24 Hour Rations Guide
For a guide on how to correctly fill the boxes with the correct rations, please take a look at 'The 24 Hour Ration Guide'.