The video above shows how to multiply items and how to instantly get Survivor XP, unlimited medkits, resources, weapon upgrades and money in  Dying Light, the video-game.

Step 1: Buy lockpicks.

Step 2: Get a Relief Package from a drop.

Step 3: Drop the lockpicks in your stash. The amount of lockpicks from your stash is equal to the amount of items you will get.

Step 4: In your stash, highlight the lockpicks and press A+B on Xbox One or X+Circle on PS4. Make sure you see a small window and you automatically exit the stash. Wait for the window to disappear.

Step 5: Access your stash again, and in the background scroll down to the relief package from your inventory. Press triangle on PS4, or Y on Xbox One, to move the items to your stash.

Step 6: Access your stash again, and in the background scroll down to the relief package from your inventory. Press triangle on PS4, or Y on Xbox One, to move the items to your stash.

Step 7: Now, take the packages to your quartermaster.

Note: You can use the same method to get infinite medkits, mods, or other items, but not weapons.