How to Increase Marathon Vault Capacity: Storage Size Upgrade Guide

A futuristic character with white hair and face paint looks intently to the left. Beside them is a game inventory screen displaying colorful weapons.
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By Alexandria LopezStaff Writer

A futuristic character with white hair and face paint looks intently to the left. Beside them is a game inventory screen displaying colorful weapons.
  • Primary Subject: Marathon (Current Season/Launch Version)
  • Key Update: Players can unlock up to 240 additional vault slots by progressing through five levels of the CyberAcme faction expansion tree.
  • Status: Confirmed
  • Last Verified: March 9, 2026
  • Quick Answer: To increase Marathon vault capacity, purchase "Expansion" upgrades in the CyberAcme faction tree using Credits, Unstable Diodes, and Unstable Gunmetal. Upgrades reset every season.

With a game like Marathon, which emphasizes looting, increasing your vault capacity is crucial for storing your items.

In Marathon, your vault serves as the home for all the items you can loot from a successful raid. To gather all the necessary items, equipment, and consumables, having a proper vault capacity is vital. But upgrading your storage isn't as easy as it seems.

Here's everything you need to know about sizing up your vault in Marathon.

How to Increase Vault Capacity in Marathon

To gain more Vault Spots, you need to purchase the "Expansion" upgrade in the CyberAcme faction tree. There are five total expansion levels, and unlocking all five will score you an extra 240 slots. But buying these expansion levels isn't cheap.

Video game inventory screen showing a list of weapons and equipment. The main panel displays item slots and backpack space. The right side shows colorful weapon icons.
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Credit: Bungie

Here's everything you need to upgrade your vault space, including what rank you need to be, how many credits you need to spend, and more:

  • Expansion Level 1 (8 additional rows): CyberAcme Rank 3, 2,500 Credits, 12 Unstable Diode
  • Expansion Level 2 (8 additional rows): CyberAcme Rank 7, 4,000 Credits, 22 Unstable Diode, 12 Unstable Gunmetal
  • Expansion Level 3 (6 additional rows): CyberAcme Rank 12, 5,000 Credits, 27 Unstable Diode, 15 Unstable Gunmetal
  • Expansion Level 4 (4 additional rows): CyberAcme Rank 18, 7,000 Credits, 30 Unstable Diode, 18 Unstable Gunmetal
  • Expansion Level 5 (4 additional rows): CyberAcme Rank 28, 10,000 Credits, 50 Unstable Diode, 30 Unstable Gunmetal
Video game screen with a futuristic interface, showing a weapon aiming at a labeled storage crate. A "Depleted Shield Charge" item is available. The scene conveys a high-tech, tense atmosphere.
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Credit: Bungie

Take note: these upgrades will only last for the current Season. After the Seasonal Wipe, you will need to unlock the upgrades again. It's unknown if the requirements for each expansion level will be the same.

If you want to hoard rare gear, you should prioritize this upgrade before others. The base Vault Space is extremely limited, and rarer items take up more room. Even if you are interested in other upgrades, focus your attention on CyberAcme to increase your storage capacity.

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