When talking about survival kits, IMO what you put together yourself may actually be superior to what you could buy. Mostly because you can tailor it to your locale. But it does need to be small and light enough for you to carry it on your person. If you need it, it is quite likely that you will have to leave in a hurry. One of the most important things to carry is a good knife. It doesn't need to be a Crocodile Dundee type of knife, but it does need to be sharp. Plus you need to wear practical clothing. Way too often you see guys wearing just shorts, a T shirt and flip flops. In a survival situation this type of clothing will degrade your chances of survival. Sturdy pants or jeans, good practical footware and strudy shirt will help increase your survival chances.