The issue, as I see it, is that you are passing along information that the characters would not otherwise possess. The contents of your pack, for instance, to a character that has not searched it, or the effects of the potions in your pack.
As this would give pertinent and specific information to the situation (ie, your character will wake up and be active again once another character opens your pack, finds the red potion, and pours it into the guy), it is the very definition of metagaming. As would anyone acting on that knowledge.