I usually don't stay overnight, but had to once or twice..

Therefor I usually don't cook, or I use the Esbit-stove to boil 2 or 3 cups of water to warm dried-food rations. In a emergency, I plan to use wood for fuel.(hence the saw)
Very. It's just unbelievable!
At work and school fortunately not (all those medicines, needles, etc.) But I always manage to get hurt one way or another...(splinters and cuts beeing the most common) That's what the 'overkill' FAK is for

I also am a firm believer that you should carry a good FAK wich isn't just a 'cuts and scrapes-kit' everywhere you go. But that's just my opinion.
As for the pack, the Karrimor Sabre 30l: I got this in my opinion great backpack from my local outdoor-shop in The Netherlands. I don't know if it's available online in the US.
This is a UK-link to the 45l. version:
http://www.raymears.com/shop_item_desc.cfm?id=293&itemType=Rucksacks