Survival knives.

There are a half million designs.

Most Chinesium blades have bottle openers, (Going to need that if you find a case of old beer in the wild) holes drilled in the blade in case you need to use it to screen sunlight?

Crazy stuff.

My first choice for a single survival knife is the Cold Steel Bushman. Stupid strong. One piece. Can be attached to a wood pole, long or short, as a machete or spear. High carbon steel with a great phosphate finish. Had mine since 1991.

You will not be disappointed.