Depends on the type of outdoor adventuring you are doing. For example, I carry both a saw and a hatchet in my Jeep at all times. However, when I do not have the Jeep with me (hiking, backpacking, took a friends car, etc) I prefer to carry a sturdy fixed blade knife on my belt. Personally I find a hatchet and saw too big and bulky to carry comfortably on my person, and they do not fit well in my backpack. Also a sturdy fixed blade knife like a mora is more than capable of cutting the limbs needed to build a shelter.