Another pretty easy achievement.
While you go about looting, you will find these orange backpack looking items, if you pick these up, it will go to the 'Rucksack' item location in your carry inventory under 'Equipment'. You will be able to carry this back to the home base, go to the Storage facility area and press the Y (
) button as if you were opening the tab to manage your storage facility and this will drop off the rucksack to the storage facility and the achievement will pop.
If you find 2 or more during a single looting session, assuming you are in a vehicle, you will be able to place the extras in the 'boot/trunk' of the vehicle until you return to your home base. If you keep the rucksack in the vehicle until you get to the home base (Or use the one you are carrying and place it into the car), you will also be able to double up the achievement with;