WIP

code/game/objects/structures/crates_lockers/crates/bins.dm

@@ -14,15 +14,15 @@
 	..()
 	update_icon()
 
-/obj/structure/closet/crate/bin/update_icon()
-	..()
+/obj/structure/closet/crate/bin/closet_update_overlays(list/new_overlays)
+	. = new_overlays
 	cut_overlays()
 	if(contents.len == 0)
-		add_overlay("largebing")
+		. += "largebing"
 	else if(contents.len >= storage_capacity)
-		add_overlay("largebinr")
+		. += "largebinr"
 	else
-		add_overlay("largebino")
+		. += "largebino"
 
 /obj/structure/closet/crate/bin/attackby(obj/item/W, mob/user, params)
 	if(istype(W, /obj/item/storage/bag/trash))

code/game/objects/structures/crates_lockers/crates/critter.dm

@@ -22,14 +22,14 @@
 
 	return ..()
 
-/obj/structure/closet/crate/critter/update_icon()
-	cut_overlays()
+/obj/structure/closet/crate/critter/closet_update_overlays(list/new_overlays)
+	. = new_overlays
 	if(opened)
-		add_overlay("crittercrate_door_open")
+		. += "crittercrate_door_open"
 	else
-		add_overlay("crittercrate_door")
+		. += "crittercrate_door"
 		if(manifest)
-			add_overlay("manifest")
+			. += "manifest"
 
 /obj/structure/closet/crate/critter/return_air()
 	if(tank)

code/game/objects/structures/crates_lockers/crates/secure.dm

@@ -13,14 +13,14 @@
 		return 0
 	. = ..()
 
-/obj/structure/closet/crate/secure/update_icon()
-	..()
+/obj/structure/closet/crate/secure/update_overlays()
+	. += ..()
 	if(broken)
-		add_overlay("securecrateemag")
+		. += "securecrateemag"
 	else if(locked)
-		add_overlay("securecrater")
+		. += "securecrater"
 	else
-		add_overlay("securecrateg")
+		. += "securecrateg"
 
 /obj/structure/closet/crate/secure/take_damage(damage_amount, damage_type = BRUTE, damage_flag = 0, sound_effect = 1)
 	if(prob(tamperproof) && damage_amount >= DAMAGE_PRECISION)