Just a few things that popped into my head: (I'll preface this with the comment that I am not familiar with the size of the bag so please forgive if I under/over estimate) (and enough for 2)
Water, FAK,Cash (amount to be determined by you), Cell, Whistle, Compass ,Flashlight,Fire starting (ie lighter etc) Cover (ie blanket/windbreaker... whatever you prefer), some snacks (yes I have kids).
I'd include extra prescribed pain meds (obvious reasons) as well as a list of my meds (with dosages and times per day) (though I think EVERYONE should carry their own lists). I'd also have my doctor's name and numbers on that list.
Hope this helps some.....