When you are in a survival situation you are almost guaranteed to have some kind of first aid need that will arise. Not having a well assembled first aid kit in an already chaotic situation can make everything much worse.
we will start with the pack itself:
The pack is made by Voodoo tactical (http://www.voodootactical.net/p-1075-voodoo-tactical-molle-utility-pouch-new-resue-red.aspx)
It is a MOLLE compatible first aid pouch with heavy duty zipper. This bag cost around $15 dollars, I bought mine at a local store but they can be purchased from the link.
You want your first aid kit to be the last thing loaded into your Bug Out Bag as it needs to be easily accessible. Your first aid kit should be easy to find in your bag based off of site and feel.
Step 1: CPR pocket resuscitator
I purchased this model on eBay for around $10. The one feature that you want to make sure that your CPR mask has is a one way valve. Often times a person receiving CPR will vomit, this valve will keep that vomit out of your mouth. also look for a mask that comes in a nice hard case and includes gloves.