Published at Wednesday, August 29th 2018, 07:05:38 AM by Rhonda Nixon. Knives. Survival knives have many designs and sizes. There are long and heavy survival knives with a design similar to a machete. Some are still built based on the design of the Bowie knife, with a long strong blade. Still other survival knives are of a folding design for compact carrying. We will cover some of the designs and features commonly found on survival knives.