Survival knives come in all shapes and sizes. I've seen fixed blade knives with 9.5" tool steel blades and folding knives with 3.44" stainless blades called "survival" knives. Since a survival knife is the one you have with you when the time to survive comes upon you, odds are the folder will be your survival knife. Wilderness knives would make great tools in a survival situation, but figure the odds that you'd be so equipped.