It would probably be a get home bag for the most part. Its 17 miles from work to my house and its mostly rolling hills and open farm land. If I had to bug out I have a large alice pack that im working on for a more serious situation. My bug out location is ten miles from my house.
For a get home bag at that distance you don't need to carry the world on your shoulders. It's good to take into mind that it could take longer than you'd like so work around that. Food, water, shelter and security are good places to start. So is figuring the bag your going to base it off of and the space you'll have to work with. Camelbak's and other hydration backpacks make good bag for either getting home or bugging out. It's all in the size you use. Small ones with a little extra space can be enough for getting home.
Amazon.com: camelbak - Hydration Packs / Backpacks & Bags: Sports & Outdoors
Shelter can be provided with a military style poncho and some 550 cord between some trees. Enough for a night anyways or two and you can use it for rain protection while moving and it rolls up small for storage.
http://www.amazon.com/gp/search/ref...s=aps&field-keywords=poncho&rh=i:aps,k:poncho
For food think about what you normally it and what would be packable and go furthest. Many people, myself included like MRE entree's stripped down to there last wrapper. One can be fairly filling. A couple should be fine for you with a few power or protein bars thrown in the pack.
Amazon.com: mre entree
Dehydrated is also good, but you have to use some of your water to hydrate them which can be a water drain if it's not heavily available.
Amazon.com: Mountainhouse entree
For water, if you don't go with a bladder pack, than a Nalgene bottle or military canteen is good.
Amazon.com: nalgene
You'll need to purify the water so a filter is next or you can use tablets if your comfortable with what water sources are around you.
Amazon.com: Katadyn
Amazon.com: water tablets
For fire, simple lighters can be fine, but fire starters are tougher.
Amazon.com: firesteel
A very important tool for any form of bugging out or getting home if a good knife. It's useful for building shelter, cleaning game if you get some, cutting rope, security, eating, etc...
Fixed blades are tougher, but a good folding knife of the right size and quality can do a lot.
Amazon.com: Spyderco
Think about protective clothing in the truck to keep to go with you when you leave it.
Maps, a compass, a flashlight, and small medical supplies, especially prescription spares if you take them are a priority.