Direct answer
Complete the prerequisite: Moder Go to the location: Camp — Haldor Choose a listed purchase; pay its price. Wider Pockets Coins ×1000 Buying this upgrade adds 1 inventory row, up to 9 rows. Each character can buy each upgrade once.
Haldor — Wider Pockets · Shop unlocks

Result
Complete the prerequisite: Moder → Choose a listed purchase; pay its price. Wider Pockets Coins ×1000
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