Get yourself a vehicle before you try this. Start by looking for desired materials, such as construction materials, fuel, or medicine. Gather items and place them in your vehicle, except for a ruck sack's worth of material. Now, call for a scavenger. When you are advised that the scavenger is on the way, pick up the last bit of material and place it within your vehicle. The scavenger should arrive soon and will search and find a ruck sack containing that last item you had set aside. Now you can return to base with an extra set.