I don't stock them in my kits, even though I am a frequent user I am pretty sure either they would be long expired or "borrowed" when the situation arose to use them.

That said I would question if a survival situation/bug out would be a good time to use them. In my experience they can add to irritation and impatience. Though 5 hour energy is pretty mellow to me there are many who get rather jittery. To me caffeine is a known quantity and easy to use to maximum effect.

Last point for consideration, the burst of energy (even if the duration is several hours) comes at a price. When the effects wear off you crash, regardless of your current situation. This peculiarity could lead to some interesting situations.

just my .02