...The trade-off is that the larger knife may make a hopeless spear point, or be poor at food prep, first aid, or the countless other tasks that a small knife performs much better. This got me thinking, what tasks are relevant in a survival situation? I just don't think I know.
Define survival situation. For me, a military shovel can be great too as 'survival' tool. You can sharpen it and have a decent machete and a well around weapon, you can use it to clean the ground / dig holes for your fire and you in a windy / snowy situation, you can use it for cooking etc etc etc. Is not the tool per se, but what you think a tool can do for you. If you think a big knife is not good for you, that knife will not be what you need. I think that for real survival, you must think out of the box*.
*This is the reason why some are testing big fixed knifes (instead a hatchet) to chop or split wood. Or the need for a carbon-steel blade when you don't have a ferro rod around but just rocks. Or the need for a strong spine and full tang, to be capable even digging with them (sticking it in the ground slowly and pulling toward you spine first not the cutting edge first), or to be sturdy enough to support your weight if required. All these things are not something a knife is doing on daily basis, but you might be glad to have this kind of tool in a particular situation. Or not.
At the end, is not the tool, but your brain that will help you in a survival situation. The capacity to improvise is the key imo.
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