Maned-
I'm no doctor or even emt or anything (our training doesn't go quiet that far, stops at AED, CPR, and somewhat advanced first aid) but if I remember correctly most chest seals don't seal completely. They either have a one way valve or are configured so that a corner is left unsealed working in the same fashion, this will keep air from entering but will allow air out in the even the lung is releasing air.
Ziplock bags may seem odd in a kit but they are extremely useful. From a medical perspective they can create the seal noted above, hold amputated parts, depending on size (both bag and wound, something like a trash bag might be better) are part of the correct procedure in the event of disembowelment (cover it, don't push it back in). For a three day pack type thing they also make nifty water carriers.
Super glue is basically the same exact thing used as an alternative to stitches. You do need to be careful though, it should only be used in places that don't bend.