>>138112knife as a general purpose tool, for cooking, for eating (you can really eat only with wooden spoon and a knife), it is very useful in natural camping/bushcraft because of the ability to do a lot of things with sticks, precise wood carving tool, battoning is emergency technique if you don't have a hatchet
axe can do a lot of things knife can do, but can't be replaced in terms of chopping and splitting wood, that makes it essential winter tool - for firewood, also useful as a hammer tool for pegs
with help of wooden wedges you can even split longer logs, very easy to sharpen, hard to break, it is also very helpful in initial stages of woodcarving for removing spare material quickly
frame saw, lighter but less durable than axe and blades worn's off quickly, I sometimes carry one on short trips and camp near fallen trees with a lot of branches, they are hard to cop with an axe because of springing action, saw can turn it into firewood in no time
add crook knife to it and you can build a cabin with those tools
axe and saw combo can do almost anything with wood