One of the most important objects is the hatchet; not only is it the title of the work, it is vital for Brian's survival.
The hatchet helps to generate fire when Brian throws it against the wall. It also allows him to sharpen weapons such as spears for fish and helps Brian enter the plane and retrieve the survival pack. Brian is able to use the hatchet to help create an entry to his cave dwelling and a bow and arrow to kill the fool bird as a food source.
Another item is Brian's windbreaker, which becomes a shelter of sorts for him as its fabric used in different capacities to enhance his survival.
Fire is a possession that Brian appropriates. Fire is his "only friend" in the wild. It also serves as a means of keeping the mosquitoes away, providing warmth, and cooking food. Once he acquires the survival pack, he obtains a slew of belongings, such as a first- aid kit and a rifle. Of these, the transmitter helps establish his whereabouts.
There are not many possessions besides his clothes that Brian has in his time in the wild. However, the possessions he does have bag are used by him to survive the conditions in which he finds himself.