diff --git a/scripts/verify-campaign-save-normalization.mjs b/scripts/verify-campaign-save-normalization.mjs
index 0d47d61..60570eb 100644
--- a/scripts/verify-campaign-save-normalization.mjs
+++ b/scripts/verify-campaign-save-normalization.mjs
@@ -209,7 +209,16 @@ try {
       ],
       completedCampDialogues: ['dialogue-a', 17, 'dialogue-a', '', 'x'.repeat(97)],
       completedCampVisits: 'visit-a',
-      inventory: { bean: '3', ' bean ': '4', ['\uCF69']: '200', [' \uCF69 ']: '20', wine: -2, empty: 0 },
+      inventory: {
+        bean: '3',
+        ' bean ': '4',
+        ['\uCF69']: '200',
+        [' \uCF69 ']: '20',
+        rareSupply: '2000',
+        ['x'.repeat(97)]: 5,
+        wine: -2,
+        empty: 0
+      },
       selectedSortieUnitIds: { corrupted: true },
       sortieFormationAssignments: 'front',
       sortieItemAssignments: {
@@ -242,8 +251,10 @@ try {
   assert(
     malformed.inventory.bean === 7 &&
       malformed.inventory['\uCF69'] === 120 &&
+      malformed.inventory.rareSupply === 999 &&
       malformed.inventory[' bean '] === undefined &&
       malformed.inventory[' \uCF69 '] === undefined &&
+      malformed.inventory['x'.repeat(97)] === undefined &&
       malformed.inventory.wine === undefined &&
       malformed.sortieItemAssignments['liu-bei']?.bean === 2 &&
       malformed.sortieItemAssignments['liu-bei']?.salve === 1 &&
diff --git a/src/game/state/campaignState.ts b/src/game/state/campaignState.ts
index c68fdda..295c80e 100644
--- a/src/game/state/campaignState.ts
+++ b/src/game/state/campaignState.ts
@@ -268,6 +268,7 @@ const campaignInventoryCaps: Record<string, number> = {
 
 const maxCampaignStringListEntries = 128;
 const maxCampaignStringListLength = 96;
+const maxCampaignUnknownInventoryAmount = 999;
 const maxCampaignRewardNoteLength = 180;
 const maxCampaignBattleObjectiveEntries = 24;
 const maxCampaignBattleUnitEntries = 96;
@@ -967,10 +968,10 @@ function normalizeInventory(value: unknown) {
   return Object.entries(recordOrEmpty(value)).reduce<Record<string, number>>((inventory, [itemId, amount]) => {
     const normalizedItemId = itemId.replace(/\s+/g, ' ').trim();
     const normalizedAmount = normalizeNonNegativeInteger(amount);
-    if (normalizedItemId && normalizedAmount > 0) {
+    if (normalizedItemId && normalizedItemId.length <= maxCampaignStringListLength && normalizedAmount > 0) {
       const nextAmount = (inventory[normalizedItemId] ?? 0) + normalizedAmount;
-      const cap = campaignInventoryCaps[normalizedItemId];
-      inventory[normalizedItemId] = cap ? Math.min(nextAmount, cap) : nextAmount;
+      const cap = campaignInventoryCaps[normalizedItemId] ?? maxCampaignUnknownInventoryAmount;
+      inventory[normalizedItemId] = Math.min(nextAmount, cap);
     }
     return inventory;
   }, {});