Maybe some of you know that I´m a military modeller too.
I got a little kit by the brand "Tamiya"from Japan with lots of bags and stuff to put on a modern U.S. Army model in 1:35 scale.
And in this kit I found a little sheet made with carton paper.
On this sheet, there are printed lots of MRE Cartons that you have to fold and glue.
I tried this and I must say, THAT IT`S HARD!
The carton is very very tiny.
I gave my best to get it good.
This is the result:

Here in comparison with a glue bottle:

And here is the text from the kit that explains MRE´s:
In the early 80´s, the U.S. military adopted the ration called MRE(Meal Ready to eat) and it has been improved up to today.
Nowadays, there are as many as 24 different kinds of meals including vegetarian dishes.
Soldiers can have a warm meal even during operations thanks to chemical reactive heater attached to the rations.
This type of ration box contains 12 packs and is durable against airdrop impact and sever conditions.