Perhaps swap the glow stick for a mini LED flashlight like the www.fenixtactical.com E01 (very handy)and a spare AAA cell.

Add a whistle of some sort, maybe a couple of large heavy duty safety pins.

A mini vial of iodine and you could treat cuts and clean water thus dropping the alcohol swab and dioxide tabs. You could treat a lot more water as well. Not like either item is that much of a burden but you are swapping 2 items with a specific use for 1 item that is multiple use.

Why a vapour patch? and What the hell is a paper signal mirror ?