In my time on instructables I have almost never seen a survival kit with a backpack. Backpacks are very easy to carry heavy hiking backs probably arent best for this situation. So I use a black school backpack that I have had for awhile black would be easiest because you can attach reflecters on to the pack to be easily seeen by rescuers.
Step 2: Fire Starters
My preferations when it comes to fire starters are matches but that is just me you can carry a lighter. Also you may want to carry a notebook to use the paper as kindling.
Step 3: Comfort If You Need It
I carry a blanket that will cover me and one other person. To carry the blanket I sewed on a carrying bag type thing onto the backpack by my back to hold it and anything I may have found. That is really it for comfort though and if you really need a pillow use your backpack.
Step 4: Weapons and Tools
I carry quite a few things I could use as a weapon. First of I carry my pocket knife with can come in handy for alot of things, second I carry around my small co2 bb gun with two extra co2 cartridges and about a 1000 metal bbs. Also I carry a small swiss army knife which has all the things you could need. Also carry a nice little led flashlight with extra batteries!!
Step 5: Food
When your out in the middle of no where food is scarce so I bring Ramen noodles in my bag also i use foil and ziplocs to cary anything i might have killed or edible plants i have picked. I also carry three water bottles to in the pouches for bottles and one actually in the bag.