The Complete Guide to SDU Tokens in Borderlands 4: Maximize Your Inventory Space

Master SDU Token collection in Borderlands 4 with our complete guide. Learn all 13 methods to upgrade ammo capacity, backpack space, and bank storage efficiently.

TL;DR – Quick SDU Token Summary

SDU Tokens are Borderlands 4’s upgrade currency for increasing ammo capacity, inventory space, and storage. There are 13 different activities across Kairos that reward tokens, totaling 1,050 SDU Tokens available. Focus on high-value activities like Safehouses (40 tokens each) and Order Silos (40 tokens each) first, then work your way down to smaller rewards like Vault Symbols (5 tokens each).

What Are SDU Tokens and Why You Need Them

If you’ve played previous Borderlands games, you know the struggle: amazing loot everywhere, but never enough space to carry it all. SDU (Storage Deck Upgrade) Tokens solve this problem by letting you upgrade your carrying capacity for weapons, ammo, and items.

In Borderlands 4’s open-world design, these upgrades become even more crucial. You’ll be exploring vast regions, tackling multiple activities, and discovering tons of gear. Without proper SDU upgrades, you’ll spend more time managing inventory than actually playing.

What SDU Tokens Upgrade:

• Weapon ammo capacity for all gun types
• Backpack inventory slots
• Bank storage space
• Lost Loot Machine capacity

High-Value SDU Token Activities (40 Tokens Each)

1. Capture Safehouses – 560 Total Tokens

What You Get: 40 SDU Tokens per Safehouse Total Available: 14 Safehouses across all regions How It Works: Find a Datapad, then locate the command console to claim ownership

Pro Tip: Safehouses also serve as fast travel points and respawn locations, making them essential for exploration. Prioritize these since they offer the highest total token reward (560 tokens combined).

Safehouse Locations by Region:

• The Fadefields: 4 Safehouses
• Terminus Range: 4 Safehouses
• Carcadia Burn: 3 Safehouses
• Dominion: 3 Safehouses

2. Capture Order Silos – 360 Total Tokens

What You Get: 40 SDU Tokens per Silo Total Available: 9 Order Silos Bonus Features: Fast travel points + help locate Vault Key Fragments

These are essentially upgraded fast travel points that also assist with Vault Key Fragment hunting. The grappling feature makes them invaluable for traversal.

3. Hack Ancient Crawlers – 400 Total Tokens

What You Get: 40 SDU Tokens per Crawler Total Available: 10 Ancient Crawlers Challenge Level: Requires climbing skills and some combat

These massive abandoned vehicles are now Ripper and Order outposts. The climbing mechanic adds a fun platforming element to token collection. Perfect for players who enjoy exploration challenges.

4. Clear Abandoned Auger Mines – 280 Total Tokens

What You Get: 40 SDU Tokens per Mine Total Available: 7 Mines Combat Difficulty: Boss fights required

Expect serious wildlife encounters and challenging boss battles. These are mini-dungeons that test your combat skills while rewarding substantial tokens. Great for players who want to combine boss farming with token collection.

5. Raid Order Bunkers – 240 Total Tokens

What You Get: 40 SDU Tokens per Bunker
Total Available: 6 Bunkers Special Requirement: Need Locust Canisters to break shields

Strategy Tip: Stock up on Locust Canisters before attempting these. The Order guards inside are well-equipped, so come prepared with your best gear and elemental damage knowledge.

6. Assault Ripper Drill Sites – 240 Total Tokens

What You Get: 40 SDU Tokens per Site Total Available: 6 Drill Sites Combat Style: Wave-based defense + boss fight

These locations force you into survival scenarios against Ripper gangs. The wave-based combat culminates in a boss fight, making them perfect for testing your character build effectiveness.

Medium-Value Token Activities (15-20 Tokens Each)

7. Hack Propaganda Speakers – 540 Total Tokens

What You Get: 20 SDU Tokens per Speaker Total Available: 27 Speakers across all regions Unique Feature: Detected by audio cues

Gameplay Tip: Listen for the Timekeeper’s voice broadcasts to locate these. The 4-wave enemy spawn system makes this a great way to practice combat while earning tokens. Use ECHO-4’s hacking ability strategically.

8. Deliver Lost Capsules – 300 Total Tokens

What You Get: 15 SDU Tokens + bonus loot per Capsule Total Available: 20 Capsules Challenge: Must walk back to Safehouses (no vehicles!)

Important: You cannot use vehicles while carrying these capsules, turning token collection into an escort mission. Plan your routes carefully and clear enemies along the way first.

9. Solve Evocarium Puzzles – 270 Total Tokens

What You Get: 15 SDU Tokens per Evocarium Total Available: 18 Evocariums
Puzzle Type: Golden orb collection using scan lines

These environmental puzzles add variety to token collection. Follow the scan lines to locate golden orbs, then place them on central pillars. Great for players who enjoy exploration and problem-solving.

Lower-Value Activities (5-10 Tokens Each)

10. Open Survivalist Caches – 100 Total Tokens

Location: Only in The Fadefields region Reward: 10 tokens + level-appropriate loot per cache

11. Meditate at Auger Shrines – 100 Total Tokens

Location: Exclusively in Terminus Range Unique Interaction: Meditate, then punch the revealed spirit

12. Crack Electi Safes – 130 Total Tokens

Primary Location: Mostly in Carcadia Burn (6 in Ruined Sumplands alone) Method: Simple kick interaction

13. Investigate Vault Symbols – 230 Total Tokens

What You Get: 5 SDU Tokens per Symbol Total Available: 46 Symbols (most numerous activity) Visual Cue: Bright orange burning symbols

While Vault Symbols offer the least tokens individually, their abundance makes them worth collecting during exploration. Think of them as bonus tokens while completing other activities.

Strategic Token Collection Tips

Early Game Priority Order:

1. Safehouses (highest total value + fast travel)
2. Order Silos (fast travel + Vault Key Fragment assistance)
3. Propaganda Speakers (good token-to-effort ratio)
4. Ancient Crawlers (moderate difficulty, good rewards)

Mid-Game Focus:

• Tackle Auger Mines and Bunkers when your gear improves
• Use SHIFT codes for better equipment before challenging activities
• Consider respeccing for combat-heavy token sources

Completionist Approach:

• Collect Vault Symbols during other activities
• Use vehicle access for efficient region traversal
• Save Lost Capsules for when you know Safehouse locations well

Token Management and Upgrade Strategy

With 1,050 total SDU Tokens available, plan your upgrades wisely:

Recommended Upgrade Order:

1. Ammo capacity for your main weapon types
2. Backpack space for better loot management
3. Bank storage for long-term gear collection
4. Lost Loot Machine capacity

Level Considerations: Remember that Borderlands 4 has a level cap system, so plan token collection across multiple playthroughs if needed.

Regional Token Distribution

The Fadefields: Mix of all activity types, great starting region Terminus Range: Heavy on shrines and climbing challenges Carcadia Burn: Safes and drilling sites dominate Dominion: Urban activities with bunkers and speakers

Conclusion

SDU Token collection in Borderlands 4 rewards thorough exploration and combat mastery. Start with high-value, exploration-friendly activities like Safehouses and Order Silos, then work toward the combat challenges as your character develops.

The open-world design makes token hunting feel natural rather than grindy—you’ll discover most locations organically while exploring Kairos. Just remember: every token collected is permanent inventory relief, making your Vault Hunter journey significantly more enjoyable.

For more Borderlands 4 optimization guides, check out our complete beginner’s guide and trophy achievement guide.

Official Game Links:

PlayStation Store

Official Borderlands 4 Website

Steam Store Page