I've recently added one of
these to my BOB.
I have also found these
rations and they are lightweight and very tasty.
Most of the BOBs described always seem to be light on food requirements. For 3 days or 72hrs folks should be looking at 9000 Kcal. i.e. around 2 Kg or 4.5lbs weight of food.
How do these compare to Mountain House, or similar, US brands?
If you don't know, then perhaps a food swap is in order?