The bag of holding (and I guess backpack) balancing pass no one asked for (#11864)

* Ok

* whew

* ok

* fix

* ehh

* fix

* buff disks

* Update _compile_options.dm

* Update tgstation.dme

code/game/objects/items/storage/backpack.dm

@@ -24,9 +24,9 @@
 /obj/item/storage/backpack/ComponentInitialize()
 	. = ..()
 	var/datum/component/storage/STR = GetComponent(/datum/component/storage)
-	STR.max_combined_w_class = 21
-	STR.max_w_class = WEIGHT_CLASS_NORMAL
-	STR.max_items = 21
+	STR.storage_flags = STORAGE_FLAGS_VOLUME_DEFAULT
+	STR.max_volume = STORAGE_VOLUME_BACKPACK
+	STR.max_w_class = MAX_WEIGHT_CLASS_BACKPACK
 
 /*
  * Backpack Types
@@ -64,9 +64,9 @@
 /obj/item/storage/backpack/holding/ComponentInitialize()
 	. = ..()
 	var/datum/component/storage/STR = GetComponent(/datum/component/storage)
-	STR.allow_big_nesting = TRUE
-	STR.max_w_class = WEIGHT_CLASS_BULKY
-	STR.max_combined_w_class = 35
+	STR.max_w_class = MAX_WEIGHT_CLASS_BAG_OF_HOLDING
+	STR.storage_flags = STORAGE_FLAGS_VOLUME_DEFAULT
+	STR.max_volume = STORAGE_VOLUME_BAG_OF_HOLDING
 
 /obj/item/storage/backpack/holding/suicide_act(mob/living/user)
 	user.visible_message("<span class='suicide'>[user] is jumping into [src]! It looks like [user.p_theyre()] trying to commit suicide.</span>")
@@ -344,7 +344,7 @@
 /obj/item/storage/backpack/duffelbag/ComponentInitialize()
 	. = ..()
 	var/datum/component/storage/STR = GetComponent(/datum/component/storage)
-	STR.max_combined_w_class = 30
+	STR.max_volume = STORAGE_VOLUME_DUFFLEBAG
 
 /obj/item/storage/backpack/duffelbag/captain
 	name = "captain's duffel bag"