Arena Breakout Storage Guide: E-Box & Expansion Costs 2026

Understanding Arena Breakout's Storage System

Arena Breakout's inventory operates on a grid-based structure where each item occupies specific slot dimensions. Weapons consume 4-7 slots, armor rigs take 12-20 slots. The base 350-grid stash holds 15-20 full loadouts when optimized but creates bottlenecks around level 25-30 when quest rewards and successful extractions accumulate faster than consumption.

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Why Storage Expansion Matters

Expanded capacity enables strategic stockpiling during market fluctuations. When ammunition prices spike or weapon parts become scarce, adequate storage maintains operational readiness. Quest progression requires collecting multiple specific items across raids—proper storage lets you accumulate materials passively rather than dedicating focused farming sessions.

Optimal expansion priority:

1. 1.5M Koen mission (permanent base stash expansion)
2. 1.85M Koen container (key storage)
3. 2M Koen box (150 permanent slots)
4. 8M E-Box (late-game, resets seasonally)

Storage Types: Stash vs E-Box vs Expansion Box

Main Stash: Permanent, always-accessible storage. Expansions purchased through Koen missions persist through seasonal wipes.

E-Box: Premium storage costing 8M Koen for 150 slots. Resets with season wipes—temporary investment for end-game players.

Expansion Boxes: Raid-found containers like Large EBox and Large Misc Case. Occupy minimal stash footprint while offering significantly larger internal capacity, functioning as nested storage multipliers.

What Is E-Box in Arena Breakout?

E-Box offers 150 additional inventory slots for 8M Koen. Unlike permanent stash upgrades, E-Box capacity resets during seasonal wipes. You're essentially renting storage space for each season's duration.

E-Box Capacity and Access

The 150-slot E-Box increases total storage from 350 base grids to 500 grids—a 43% capacity increase accommodating 8-10 additional full loadouts. The grid system operates identically to main stash, accepting any item type without restrictions.

E-Box appears as a separate storage tab within your hideout interface. Navigation between stash and E-Box requires manual item transfers—no automatic sorting or quick-move functionality exists.

How to Expand Storage: Step-by-Step Guide

Prerequisites

Before investing in storage expansion, complete basic hideout upgrades and establish consistent Koen income streams. Complete the 3x3 Koen Chest tasks to unlock container access first.

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Expansion Priority Sequence

1. 1.5M Koen Mission: First major investment. Permanent base stash expansion persisting through seasonal wipes. Best long-term value.

2. 1.85M Koen Container: Dedicated key storage. Keys are high-value, low-volume items that clutter general storage.

3. 2M Koen Storage Box: Another 150 permanent slots.

4. 8M E-Box: Only after exhausting permanent expansions. Provides equivalent capacity but resets seasonally.

Post-Expansion Organization

Immediately reorganize using category-based zones:

• Top-left: Weapons
• Top-right: Armor
• Bottom-left: Consumables
• Bottom-right: Quest items

Implement the 5,000 Koen per slot threshold: retain items exceeding 5,000 Koen per slot value, sell items below 4,000-5,000 Koen per slot.

Bond Cost Breakdown

Elite Subscription Pricing

Elite Subscription: 500 Bonds, adds 150 grids (350 to 500 total). Same capacity as 8M Koen E-Box but requires recurring Bond expenditure.

Elite Trial: 300 Bonds for 30 days. Includes Composite Box, Bulletproof Box, and 150-grid capacity increase. Excellent value for testing premium storage.

Elite Subscription also enables 300 weekly Market listings and 8 simultaneous simulation listings—economic advantages that compound storage benefits.

Premium Cases

Composite Case: 1,000 Bonds for 30 days. 3x2 slots (6 grids) with death protection—carry one case per raid without losing contents upon death.

Bulletproof Case: 500 Bonds for 30 days. 2x2 slots (4 grids) with death protection. Better for compact high-value items like rare keys or intelligence folders.

Titanium Case: 9 slots (3x3) through season missions—free premium storage for completing progression objectives.

Total Bond Investment

Maximum Bond-based storage requires:

• 500 Bonds: Elite Subscription
• 1,000 Bonds: Composite Case
• 500 Bonds: Bulletproof Case (optional)
• Total: 2,000 Bonds monthly

Expansion Box vs E-Box: Which to Choose?

Key Differences

E-Box: 150 flat slot increase to base stash. 8M Koen cost. Resets seasonally. Universal storage for all item types.

Expansion Boxes: Raid-found containers that multiply storage efficiency through internal capacity exceeding external footprint.

• Large EBox: Occupies 9 grids (3x3), expands to 70 grids (7x10). Net gain: 61 slots.
• Large Misc Case: Occupies 9 grids (3x3), expands to 84 grids (7x12). Net gain: 75 slots.

Cost-Benefit Analysis

Large EBox Trade (Evita):

• Video Camera x3
• Golden Cube x3
• Gold Block x2
• Sound-Muffling Cotton x6

Accumulating these barter items costs significantly less than 8M Koen at typical market rates. However, expansion boxes require active farming and successful extractions—time investment and risk factors absent from direct E-Box purchases.

Optimal Strategy

Combine permanent Koen-based stash expansions, raid-found expansion boxes, and selective Bond-based solutions. Nest expansion boxes within your expanded stash to multiply storage efficiency. A properly organized stash using multiple Large Misc Cases can effectively double usable capacity.

Storage Capacity Increases Per Level

Slot Increases by Tier

• Base: 350 grids
• Elite Subscription or 1.5M Koen mission: +150 slots (500 total)
• 2M Koen storage box: +150 slots (650 total)
• 8M E-Box: +150 slots (800+ total when stacking all methods)

Quest and contact-based storage provide up to 4 upgrades through progression without direct currency expenditure.

Calculating Your Ideal Size

Each 150-slot expansion accommodates 8-10 additional full loadouts. Monitor storage utilization over several sessions:

• Above 85% capacity: Expansion becomes priority
• Below 70% utilization: You're selling too aggressively or haven't accumulated sufficient valuable items

When to Expand: Optimal Timing

By Progression Stage

Early Game (Levels 1-25): Focus on free storage expansion quests and optimizing existing space. Avoid expensive expansions.

Mid-Game (Levels 25-40): Prioritize 1.5M Koen stash expansion when hitting consistent capacity constraints. This timing coincides with establishing reliable Koen income.

Late-Game (40+): Consider E-Box after exhausting permanent options if you have 10M+ Koen reserves. The 8M cost becomes manageable percentage of total wealth.

Signs You Need More Storage

• Frequently selling valuable items (50,000+ Koen) just to free space
• Unable to maintain 3-5 backup loadout sets
• Regularly discarding quest materials you'll need later

Bond Allocation for New Players

Prioritize Elite Trial (300 Bonds) over individual storage purchases. Avoid Composite/Bulletproof Cases until you've established consistent high-value item extraction patterns.

Maximizing Efficiency Without Spending Bonds

Smart Item Management

Magazine Detachment: Remove magazines from weapons to recover 20-30 slots. Magazines occupy 1-2 slots each.

Pistol Grip Removal: Many rifles compress from 2x4 or 2x5 slots to 1x4 or 1x5 configurations when grips are removed—storing twice as many weapons in equivalent space.

T6 Ammo Racks: Hold 60 M61 rounds each, consolidating loose ammunition.

Rig Nesting for Net Slot Gains

B3 Universal Chest Rig: Occupies 12 slots, provides 16 internal slots. Net +4 slots when filled. Seven nested B3 Rigs create 40 effective slots from 12-slot footprint.

FA Commander Rig: Occupies 12 slots, provides 20 internal slots. Net +8 slots. Costs 40,000 Koen. Most efficient rig-based storage—67% capacity multiplication.

Cowhide Rig: Occupies 20 slots, provides 25 internal slots. Net +5 slots.

Raid-Found Containers

Standard Weapon Storage Box: 8 slots (4x2), expands to 42 slots (7x6). Net +34 slots for weapons.

Koen Chest: 21 slots (7x3) accessible through completing tasks. Free storage expansion.

Exchange raid-found storage boxes with Evita for cases, converting temporary loot into permanent storage solutions.

Common Mistakes to Avoid

Expanding Too Early

Purchasing 8M E-Box before completing cheaper permanent expansions wastes resources on temporary capacity. The 2M Koen box provides permanent capacity at 75% discount.

Ignoring Free Optimization

Magazine detachment, grip removal, and rig nesting can recover 150+ slots—equivalent to full E-Box expansion—without currency expenditure.

Not Planning for Seasonal Resets

E-Box resets with season wipes—your 8M Koen investment provides zero value in subsequent seasons. Hideout upgrades persist through wipes. Calculate expected season duration before committing to E-Box.

Advanced Storage Management Tips

Category-Based Organization

Designate specific stash zones for distinct categories. Use expansion boxes as category containers:

• Large Misc Cases: Quest materials
• Standard Weapon Storage Boxes: Backup weapons
• Koen Chests: High-value trade goods

Color-code items using tagging system to prevent accidental sales of quest-critical materials.

Storage Expansion ROI Calculation

Divide total cost by slots gained, compare against your average Koen-per-slot value. If you store items worth 8,000 Koen per slot, a 150-slot expansion costing 8M Koen breaks even when slots remain consistently utilized.

Factor opportunity cost—8M Koen could purchase high-value items during market downturns for resale during price spikes.

Maintaining Efficiency at Maximum Capacity

Weekly inventory audits: Sell items occupying storage for 7+ days without use.

Minimum value thresholds: Early-game retain 10,000+ Koen items, late-game consider 50,000+ Koen minimums.

5,000 Koen per slot baseline: Retain items exceeding this value, sell items below 4,000-5,000 Koen per slot.

FAQ

How much does storage expansion cost?

1.5M Koen for base stash, 8M Koen for E-Box. Bond options: 500-Bond Elite Subscription, 1,000-Bond Composite Case. Optimal sequence: 1.5M stash → 1.85M container → 2M box → 8M E-Box.

What's the maximum storage capacity?

800+ grids when combining base 350 grids, Elite Subscription 150 grids, multiple Koen expansions (300+ grids), plus nested expansion boxes providing hundreds of additional effective slots.

Does storage carry over between seasons?

Hideout upgrades including Koen-based stash expansions persist through wipes. E-Box resets with season wipes. Elite Subscription and premium cases also reset.

Is storage expansion worth Bonds?

500-Bond Elite Subscription provides 150 slots plus market benefits valuable for active traders. Composite/Bulletproof Cases suit players regularly extracting high-value items needing death protection.

Can you expand storage without Bonds?

Yes—Koen-based expansions (1.5M stash, 2M box, 8M E-Box), raid-found expansion boxes, rig nesting, and quest-based containers like Titanium Case provide free storage expansion.

How do I access raid-found expansion boxes?

Extract Large EBox or Large Misc Case during raids, then trade with Evita using required barter items. Large EBox needs Video Camera x3, Golden Cube x3, Gold Block x2, Sound-Muffling Cotton x6.