the pouch is just like a iron can,its many layers of thin metal
and plastic and seals,it have also been in a autoclave
just like how they use to sterilice hospital gear before
surgury. so its safe as long as you dont eat when bulging
like cans or leaking weirde taste smell

some would say
mres taste and smell weird anyhow
the things that change with age is : color,salty nes,texture
al this deppends on how it was stored,hot cold hot cold stresses
the food and it breake a part.
just like this imp meal,
this was a big piece of chicken or was it turkey?
and it have stored outside for many years in a car,hot cold hot cold
btw i didnt eat this

cheers norge