due to temperature variances and moisture condensation, etc. in many locales.
... ammunition, and medications are exceptionally short lived, in my regional climate (East KY).
Good points.
I vacuum pack in mylar,still the temp is a big factor for meds/food.
Most of stuff in our BOB in truck is either in vacuumed mylar or food storage bags to protect from moisture and to smash down bulky items.