Starting Bag Size
You begin with 30 bag slots (shown in the lower portion of your inventory screen). A separate 20-slot equipment bar along the top holds your tools and weapons and does not count toward bag space. Eight expansions are available, each adding 5 slots, bringing the bag total to 70 slots.
Because your day-to-day tools fill an entire row on their own, upgrading the bag early gives you the breathing room you need for gathering trips, quest items, and gifts.
How to Expand Your Bag
Open your bag (press B on PC).
Below your existing slots, in the bottom-left corner, there is a button labeled "Expand". Click it.
A pop-up shows the materials needed for the next expansion tier.
If you have all the required materials in your inventory or nearby storage, confirm the expansion. If you are missing something, hover over the item icon to see its name and how to obtain it.
You do not need to visit a shop or NPC. The upgrade is built directly into the inventory screen and can be done anywhere, anytime, as long as you have the materials.
All Expansion Tiers
Each expansion adds 5 slots. The first three tiers use basic raw and refined materials that are easy to gather in the first few in-game days. From expansion 4 onward, the recipes grow significantly and demand products from multiple professions, farming outputs, animal drops, and crafting station output. This encourages diversifying across professions rather than specializing in only one.
Tier | Total Slots | Materials Required | Material Sources |
|---|---|---|---|
1 | 35 | Gather from trees, rocks, and shrubs. Available immediately. | |
2 | 40 | 5 Carbon Line, 5 Stone Brick, 5 Softwood Plank | Carbon Line from Spinning Wheel; Stone Brick from Furnace; Softwood Plank from Cutter |
3 | 45 | 5 Radiant Core, 5 Copper Ingot, 5 Glass Pane | Radiant Core and Copper Ingot from Furnace; Glass Pane from Cutter. Requires Fluorite and Copper from the Moonlit Forest. |
4 | 50 | 6 Bronze, 16 Flour, 6 Flannel, 5 Carbon Line | Bronze from Furnace (Copper+Tin); Flour from Separator (Wheat); Flannel from Loom; Carbon Line from Spinning Wheel. |
5 | 55 | 7 Hardwood Plank, 7 Iron Sheet, 10 Vegetable Juice, 5 Egg, 10 Protein Powder, 10 Fruit Pulp | Hardwood Plank and Iron Sheet from Cutter II; Vegetable Juice, Protein Powder, and Fruit Pulp from Separator; Eggs from Chickens or Ducks. |
6 | 60 | 5 Premium Wood Plank, 5 Alloy, 10 Sugar, 2 Sheep Milk, 10 Fish Fillet | Premium Wood Plank from Cutter; Alloy from Furnace II; Sugar from Separator; Sheep Milk from Sheep; Fish Fillet from Fishing. |
7 | 65 | Meteor Plank from Cutter III; Eternal Alloy from Furnace III; Honey from Beehives; Rice from farming. | |
8 | 70 | 4 Meteor Plank, 4 Eternal Alloy, 1 Rainbow Fabric, 5 Stardew Fern, 1 Perpetual Reactor | Rainbow Fabric from Loom; Stardew Fern is a rare gathering item; Perpetual Reactor is an endgame crafted item. |
Material Preparation Strategy
To plan ahead for all eight expansions, it helps to know which materials are bottlenecks and start stockpiling early:
Material Category | Materials | How to Prepare |
|---|---|---|
Mining products | Copper, Tin, Fluorite, Iron, Alloy, Eternal Alloy | Regular Moonlit Forest mining runs. Smelt ores at your Furnace between trips. |
Processed wood | Softwood Plank, Hardwood Plank, Premium Wood Plank, Meteor Plank | Cut trees daily and process logs at the Cutter. Hardwood comes from larger trees. |
Textiles | Carbon Line, Flannel, Rainbow Fabric | Carbon Line from Fiber at the Spinning Wheel. Flannel and Rainbow Fabric from the Loom. Keep cutting shrubs for Fiber. |
Farm products | Flour, Vegetable Juice, Protein Powder, Fruit Pulp, Sugar, Rice | Grow Wheat, vegetables, and fruit. Process at the Separator. Start farming Rice by mid-game. |
Raise Chickens/Ducks for Eggs, Sheep for Milk. Set up Beehives for Honey. | ||
Other | Fish Fillet, Stardew Fern, Perpetual Reactor | Fish Fillet from Fishing. Stardew Fern is a rare forageable. Perpetual Reactor is an endgame crafted item. |
Storage Boxes
In addition to expanding your bag, you can craft storage boxes to place on your property. Crafting stations automatically pull materials from both your bag and nearby storage boxes, so you do not need to carry everything in your inventory while crafting.
Storage Box | Capacity | Materials | Unlock Requirement |
|---|---|---|---|
Storage Box I | 18 slots | 8 Softwood | Complete "Return to the Cabin in the Woods" tutorial quest from Solara |
Storage Box II | 36 slots | 6 Softwood Plank, 3 Copper Sheet | Apprentice Crafter rank; buy blueprint from Zerine's General Store |
Storage Box III | 66 slots | 6 Hardwood Plank, 3 Iron Sheet | Junior Crafter rank; requires Worktable II; buy blueprint from Zerine's General Store |
Flawed Chests
Flawed Chests are scattered around the world and hold 32 slots (equivalent to a Storage Box II). When you open one, you can either collect the chest itself to place as storage at home, or take the contents inside (usually Coins). Keep an eye out for these while exploring, as they are a free storage upgrade early on.
Realm Box
The Realm Box is the endgame shared-inventory chest. Every Realm Box you place shares the same internal inventory, similar to an Ender Chest in other games. Items placed in one Realm Box are accessible from any other, making it invaluable for keeping supplies at your farm, the Moonlit Forest entrance, or any other frequently visited area.
Detail | Info |
|---|---|
Unlock | Intermediate Crafter certification from Zerine |
Blueprint Cost | 7,500 Coins at Zerine's General Store |
Crafting Materials | 5 Alloy, 3 Spirit Cube I, 5 Starflare Core, 6 Hardwood Plank |
Crafted At | Workbench II |
You can also access a Realm Box directly from your inventory if you carry it in your bag. Building more than one and placing them at strategic points around the island is well worth the investment. Recommended locations include your home base, the Moonlit Forest entrance, and any area where you spend significant time gathering or processing.
Storage and Inventory Tips
You can turn in materials for Bulletin Board requests and quests directly from your storage chests. You do not need to carry those items around, which saves bag space.
Gifts for NPCs are the exception. You must have those on your person.
Build Storage Box II and III from Zerine's General Store to increase home storage capacity early.
Keep one Storage Box near your crafting stations and another near your farm for convenience.
Position storage boxes near relevant workstations: ores next to smelters, cooking ingredients next to your kitchen, seeds near your crop fields.
Maintain a buffer of 5 to 10 empty bag slots before leaving your base so you have room for unexpected drops while exploring.
The Realm Box eliminates the need to carry materials back and forth between locations. Build one at home and one wherever you spend the most time.
Consider expansion tier 5 a priority milestone. It requires products from farming, ranching, and processing, so start raising Chickens or Ducks early for the 5 Eggs required.
For expansion tiers 7 and 8, begin stockpiling Honey and Rice well in advance. These take time to accumulate (20 Honey and 20 Rice for tier 7 alone).