diff --git a/Content.Shared/Physics/CollisionGroup.cs b/Content.Shared/Physics/CollisionGroup.cs
index 1c10fefd5d..775ccb7c44 100644
--- a/Content.Shared/Physics/CollisionGroup.cs
+++ b/Content.Shared/Physics/CollisionGroup.cs
@@ -48,6 +48,9 @@ public enum CollisionGroup
     MachineLayer = Opaque | MidImpassable | LowImpassable | BulletImpassable,
     ConveyorMask = Impassable | MidImpassable | LowImpassable | DoorPassable,
 
+    // Crates
+    CrateMask = Impassable | HighImpassable | LowImpassable,
+
     // Tables that SmallMobs can go under
     TableMask = Impassable | MidImpassable,
     TableLayer = MidImpassable,
diff --git a/Resources/Prototypes/Entities/Objects/Misc/pet_carrier.yml b/Resources/Prototypes/Entities/Objects/Misc/pet_carrier.yml
index 84c9c7c752..b7f296cbac 100644
--- a/Resources/Prototypes/Entities/Objects/Misc/pet_carrier.yml
+++ b/Resources/Prototypes/Entities/Objects/Misc/pet_carrier.yml
@@ -30,7 +30,7 @@
           radius: 0.45
         density: 25
         mask:
-        - SmallMobMask
+        - ItemMask
         layer:
         - MachineLayer
   - type: EntityStorage
diff --git a/Resources/Prototypes/Entities/Objects/Specific/Xenoarchaeology/artifact_equipment.yml b/Resources/Prototypes/Entities/Objects/Specific/Xenoarchaeology/artifact_equipment.yml
index c38868b399..e1716f0843 100644
--- a/Resources/Prototypes/Entities/Objects/Specific/Xenoarchaeology/artifact_equipment.yml
+++ b/Resources/Prototypes/Entities/Objects/Specific/Xenoarchaeology/artifact_equipment.yml
@@ -36,7 +36,7 @@
             radius: 0.45
           density: 50
           mask:
-          - SmallMobMask #this is so they can go under plastic flaps
+          - CrateMask #this is so they can go under plastic flaps
           layer:
           - MachineLayer
     - type: Icon
diff --git a/Resources/Prototypes/Entities/Structures/Storage/Crates/base_structurecrates.yml b/Resources/Prototypes/Entities/Structures/Storage/Crates/base_structurecrates.yml
index 95580292d9..2d84541231 100644
--- a/Resources/Prototypes/Entities/Structures/Storage/Crates/base_structurecrates.yml
+++ b/Resources/Prototypes/Entities/Structures/Storage/Crates/base_structurecrates.yml
@@ -34,7 +34,7 @@
           bounds: "-0.4,-0.4,0.4,0.29"
         density: 50
         mask:
-        - SmallMobMask #this is so they can go under plastic flaps
+        - CrateMask #this is so they can go under plastic flaps
         layer:
         - MachineLayer
   - type: EntityStorage
diff --git a/Resources/Prototypes/Entities/Structures/Storage/Crates/crates.yml b/Resources/Prototypes/Entities/Structures/Storage/Crates/crates.yml
index 1cf8083659..11c963ed22 100644
--- a/Resources/Prototypes/Entities/Structures/Storage/Crates/crates.yml
+++ b/Resources/Prototypes/Entities/Structures/Storage/Crates/crates.yml
@@ -356,7 +356,7 @@
           bounds: "-0.4,-0.4,0.4,0.29"
         density: 135
         mask:
-        - SmallMobMask #this is so they can go under plastic flaps
+        - CrateMask #this is so they can go under plastic flaps
         layer:
         - LargeMobLayer
   - type: Construction
@@ -413,7 +413,7 @@
           bounds: "-0.4,-0.4,0.4,0.29"
         density: 80
         mask:
-        - LargeMobMask
+        - CrateMask
         layer:
         - LargeMobLayer
   - type: StaticPrice
diff --git a/Resources/Prototypes/Entities/Structures/plastic_flaps.yml b/Resources/Prototypes/Entities/Structures/plastic_flaps.yml
index c4ee507395..4439c11d68 100644
--- a/Resources/Prototypes/Entities/Structures/plastic_flaps.yml
+++ b/Resources/Prototypes/Entities/Structures/plastic_flaps.yml
@@ -23,7 +23,7 @@
           bounds: "-0.49,-0.49,0.49,0.49"
         density: 100
         mask:
-        - TabletopMachineMask
+        - Impassable
         layer:
         - MidImpassable
   - type: Damageable
@@ -61,7 +61,7 @@
           bounds: "-0.49,-0.49,0.49,0.49"
         density: 100
         mask:
-        - TabletopMachineMask
+        - Impassable
         layer:
         - Opaque
         - MidImpassable