--- a/data/json/items/tool_armor.json
+++ b/data/json/items/tool_armor.json
@@ -1742,6 +1742,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_s": 100 } } ],
     "ammo": "gasfilter_s",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "armor": [ { "encumbrance": 20, "rigid_layer_only": true, "coverage": 100, "covers": [ "mouth" ] } ]
   },
   {
@@ -1769,7 +1770,8 @@
     "environmental_protection_with_filter": 16,
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
-    "use_action": [ "GASMASK" ]
+    "use_action": [ "GASMASK" ],
+    "charges_per_use": 1
   },
   {
     "id": "mask_gas_xl",
@@ -1796,6 +1798,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "flags": [ "OVERSIZE", "SLEEP_IGNORE" ]
   },
   {
@@ -1823,6 +1826,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "flags": [ "UNDERSIZE", "SLEEP_IGNORE" ]
   },
   {
@@ -1847,6 +1851,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 60 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "armor": [ { "encumbrance": 20, "rigid_layer_only": true, "coverage": 100, "covers": [ "mouth" ] } ]
   },
   {
@@ -1875,6 +1880,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "flags": [ "VARSIZE", "STURDY", "SUN_GLASSES", "SLEEP_IGNORE" ]
   },
   {
@@ -1903,6 +1909,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "flags": [ "VARSIZE", "STURDY", "OVERSIZE", "SUN_GLASSES", "SLEEP_IGNORE" ]
   },
   {
@@ -1934,6 +1941,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "warmth": 25,
     "environmental_protection": 4,
     "environmental_protection_with_filter": 16,
@@ -1958,6 +1966,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "material": [ "kevlar_layered", "steel" ],
     "symbol": "[",
     "color": "dark_gray",
@@ -1985,6 +1994,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "material": [ "kevlar_layered", "cotton" ],
     "symbol": "[",
     "color": "dark_gray",
@@ -2012,6 +2022,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "material": [ "kevlar_layered", "cotton" ],
     "symbol": "[",
     "color": "dark_gray",
@@ -2039,6 +2050,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "material": [ "kevlar_layered", "leather" ],
     "symbol": "[",
     "color": "dark_gray",
@@ -2066,6 +2078,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "material": [ "kevlar_layered", "plastic" ],
     "symbol": "[",
     "color": "dark_gray",
@@ -2137,6 +2150,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "material": [ "kevlar_layered", "fur" ],
     "symbol": "[",
     "color": "light_gray",
@@ -2164,6 +2178,7 @@
     "pocket_data": [ { "pocket_type": "MAGAZINE", "rigid": true, "ammo_restriction": { "gasfilter_m": 100 } } ],
     "ammo": "gasfilter_m",
     "use_action": [ "GASMASK" ],
+    "charges_per_use": 1,
     "material": [ "kevlar_layered", "fur" ],
     "symbol": "[",
     "color": "light_gray",