Stockpile
A Stockpile is a storage in certain structures and vehicles that can hold large amounts of particular items and sometimes even item crates, vehicles, or structures. Unlike inventories, retrieving things from it takes a certain amount of time which depends on the item type and stockpile type.
Types
Many different types of stockpiles exist, each with limits on what and how much they can hold. The most common can be categorized as follows:
- "Base": Stockpiles that can hold all types of items in nearly unlimited amount (32,000 of each). Found in all Bases
- "Storage": Stockpiles that can hold large amounts of item crates, vehicles, shippable structures, crates of vehicles, and crates of shippable structures. Found in Storage Depot, Seaport, and Storage Ship.
- Reserve Stockpile: Player-created stockpiles at Storage Depots or Seaports that are only accessible to players with a passcode and have a much faster retrieving speed.
- "Large Items": Stockpiles that can only hold most Large Items and Construction Materials in various quantities. Found in Material Transfer Station, Material Pallet, Small Flatbed Car, Rooster - Tumblebox Trailer.
- "Item Crates": Stockpiles that can only hold item crates. Found in Shipping Container.
Use
Access
Stockpiles are accessed by opening the menu of their structure or vehicle (press E). They are always displayed on the menu's right side. The number displayed on each icon indicates the amount stored. Placing your mouse over an icon shows a short description and information about it. Stockpiles can be accessed on foot or from the driver seat of certain vehicles (such as Trucks, LUVs, Fuel Tankers, Ambulances, Small Train Locomotive, and Cranes). Cranes can also deposit certain containers (Material Pallet, Resource Container, etc...) onto a structure's loading area to access its stockpile.
Certain structures can have their stockpile contents remotely checked on the map by placing the cursor on the structure's icon.
Filtering
Most stockpiles can be filtered by category by pressing the buttons at the top:
All 
Small Arms 
Heavy Arms 
Heavy Ammunition 
Utility 
Medical 
Resource 
Uniforms 
Vehicles 
Shippable Structures
A small crate sub-icon 
is displayed when filtering crates of things: 
Stockpiles can also be sorted in two specific orders via an option at the top right of the menu:
- Sorted - shows all available items first
- Unsorted - shows all items in a set order (each weapon next to their respective ammo)
Retrieving
An item can be retrieved from a stockpile by pressing LMB on its icon. It is only transferred to your inventory after an "assembly time". Retrievals can be cancelled by pressing the movement keys. Retrieving items from a vehicle gives the option to retrieve 3 at a time by pressing Shift + LMB. A few structures also allow you to retrieve custom amounts (up to 15 at a time) via the RMB context menu.
The system that controls how long retrieving takes is known as the Assembly Mechanic. This includes factors such as item, quantity, stockpile source, destination, etc. The disambiguation of this mechanic can be found here.
For quick reference:
- Retrievals made on foot takes the longest amount of time.
- Retrievals made from a Truck, Fuel Tanker, or any type of crane complete in 1/2 the time.
- Small Train Locomotive retrievals, from facility structures only, finish in 1/9th the time.
When retrieving vehicles or structures from stockpiles they spawn on a dedicated Loading Area.
Soldiers on foot can't retrieve items from stockpiles if they are carrying a Large Item.
Submitting
While accessing a stockpile, players can submit items or crates of items from their inventory by pressing RMB on them and selecting one of two options:
Submit to Stockpile- submits the selected item, but will open up a slider popup depending on how much of the same item is in the inventorySubmit All to Stockpile- submits all items/crates in the player's/vehicle's inventory
If a stockpile accepts a particular item type then crates of that item can be directly submitted to it to transfer their content into the stockpile.
For stockpiles that accept vehicles and structures:
- A vehicle can be submitted to a stockpile from the driver seat by clicking the "Submit Vehicle" button
in the menu. Alternatively, if the vehicle is packageable it can be packaged, placed on the loading area with a crane, and submitted by pressing the Submit Loading Area Equipmentbutton
in the structure's menu. - A shippable structure can be packaged, placed on the loading area with a crane, and submitted by pressing the
Submit Loading Area Equipmentbutton in the structure's menu.
Logs
Every structure with a stockpile has a View Stockpile Actions Log button 
to view the last 100 transactions. Reserve Stockpiles record the last 128 transactions (8 pages).
Capture
Rebuilding a destroyed friendly structure restores the content of its stockpile(s). For enemy structures, only 25% of each type in the original contents is restored (numbers are rounded down) except all Maintenance Supplies and Soldier Supplies (and crates of them) are deleted. For enemy Storage Depots and Seaports, before the shrinking operation, the content of all Reserve Stockpiles is dumped into the Public stockpile and any type that exceeds its storage limit (e.g. 1,000 for each type of item crate) is deleted.