Lets you wear emag on your ID slot and tweaks quick equip

code/game/objects/items.dm

@@ -50,6 +50,8 @@ GLOBAL_DATUM_INIT(welding_sparks, /mutable_appearance, mutable_appearance('icons
 	var/w_class = WEIGHT_CLASS_NORMAL
 	/// This is used to determine on which slots an item can fit.
 	var/slot_flags = 0
+	/// If set, this determines which slots are considered when using quick equip
+	var/prefered_slot_flags = 0
 	/// Determines what it can pass over/through. IE. 'PASSTABLE' will allow it to pass over tables
 	pass_flags = PASSTABLE
 	pressure_resistance = 4

code/game/objects/items/weapons/cards_ids.dm

@@ -11,6 +11,8 @@
 	desc = "A card."
 	icon = 'icons/obj/card.dmi'
 	w_class = WEIGHT_CLASS_TINY
+	slot_flags = ITEM_SLOT_ID
+
 	new_attack_chain = TRUE
 	var/associated_account_number = 0
 
@@ -29,6 +31,7 @@
 	icon_state = "emag"
 	item_state = "card-id"
 	origin_tech = "magnets=2;syndicate=2"
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 
 /obj/item/card/emag
 	desc = "It's a card with a magnetic strip attached to some circuitry."
@@ -38,6 +41,7 @@
 	origin_tech = "magnets=2;syndicate=2"
 	flags = NOBLUDGEON
 	flags_2 = NO_MAT_REDEMPTION_2
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 
 /obj/item/card/emag/pre_attack(atom/target, mob/living/user, params)
 	if(..() || ismob(target))
@@ -71,6 +75,7 @@
 	origin_tech = "magnets=2;syndicate=2"
 	flags = NOBLUDGEON
 	flags_2 = NO_MAT_REDEMPTION_2
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 
 /obj/item/card/cmag/Initialize(mapload)
 	. = ..()
@@ -95,7 +100,6 @@
 	var/total_mining_points = 0
 	var/list/access = list()
 	var/registered_name = "Unknown" // The name registered_name on the card
-	slot_flags = ITEM_SLOT_ID
 	armor = list(MELEE = 0, BULLET = 0, LASER = 0, ENERGY = 0, BOMB = 0, RAD = 0, FIRE = 100, ACID = 100)
 	resistance_flags = FIRE_PROOF | ACID_PROOF
 	var/untrackable // Can not be tracked by AI's

code/game/objects/items/weapons/storage/bags.dm

@@ -162,6 +162,7 @@
 	icon_state = "satchel"
 	origin_tech = "engineering=2"
 	slot_flags = ITEM_SLOT_BELT | ITEM_SLOT_BOTH_POCKETS
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 	w_class = WEIGHT_CLASS_NORMAL
 	storage_slots = 10
 	max_combined_w_class = 200 //Doesn't matter what this is, so long as it's more or equal to storage_slots * ore.w_class
@@ -230,6 +231,7 @@
 	storage_slots = 40 //the number of plant pieces it can carry.
 	max_combined_w_class = 40 //Doesn't matter what this is, so long as it's more or equal to storage_slots * plants.w_class
 	max_w_class = WEIGHT_CLASS_NORMAL
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 	w_class = WEIGHT_CLASS_TINY
 	can_hold = list(
 		/obj/item/seeds,
@@ -444,6 +446,7 @@
 	desc = "A bag for storing pills, patches, and bottles."
 	storage_slots = 50
 	max_combined_w_class = 200
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 	w_class = WEIGHT_CLASS_TINY
 	can_hold = list(/obj/item/reagent_containers/pill,
 					/obj/item/reagent_containers/patch,
@@ -461,6 +464,7 @@
 	desc = "A bag for the safe transportation and disposal of biowaste and other biological materials."
 	storage_slots = 25
 	max_combined_w_class = 200
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 	w_class = WEIGHT_CLASS_TINY
 	can_hold = list(/obj/item/slime_extract, /obj/item/food/monkeycube,
 					/obj/item/reagent_containers/syringe, /obj/item/reagent_containers/glass/beaker,
@@ -479,6 +483,7 @@
 	item_state = "mailbag"
 	storage_slots = 14
 	max_combined_w_class = 28
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 	w_class = WEIGHT_CLASS_TINY
 	can_hold = list(/obj/item/envelope, /obj/item/stamp, /obj/item/pen, /obj/item/paper, /obj/item/mail_scanner)
 	resistance_flags = FLAMMABLE
@@ -494,6 +499,7 @@
 	item_state = "construction_bag"
 	storage_slots = 30
 	max_combined_w_class = 60
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 	w_class = WEIGHT_CLASS_TINY
 	can_hold = list(/obj/item/airlock_electronics, /obj/item/firelock_electronics, /obj/item/firealarm_electronics, /obj/item/apc_electronics, /obj/item/airalarm_electronics, /obj/item/camera_assembly, /obj/item/stock_parts/cell, /obj/item/circuitboard, /obj/item/stack/cable_coil)
 	resistance_flags = FLAMMABLE
@@ -509,6 +515,7 @@
 	icon_state = "satchel"
 	origin_tech = "engineering=2"
 	slot_flags = ITEM_SLOT_BELT | ITEM_SLOT_BOTH_POCKETS
+	prefered_slot_flags = ITEM_SLOT_BOTH_POCKETS
 	w_class = WEIGHT_CLASS_NORMAL
 	storage_slots = 15
 	max_combined_w_class = 60

code/modules/mob/mob.dm

@@ -332,6 +332,8 @@ GLOBAL_LIST_INIT(slot_equipment_priority, list( \
 	for(var/slot in GLOB.slot_equipment_priority)
 		if(isstorage(W) && slot == ITEM_SLOT_HEAD) // Storage items should be put on the belt before the head
 			continue
+		if(W.prefered_slot_flags && !(W.prefered_slot_flags & slot)) //If there's a prefered slot flags list, make sure this slot is in it
+			continue
 		if(equip_to_slot_if_possible(W, slot, FALSE, TRUE)) //del_on_fail = 0; disable_warning = 0
 			return 1
 

code/modules/reagents/reagent_containers/glass_containers.dm

@@ -306,6 +306,7 @@
 	volume = 120
 	armor = list(MELEE = 10, BULLET = 0, LASER = 0, ENERGY = 0, BOMB = 0, RAD = 0, FIRE = 75, ACID = 50) //Weak melee protection, because you can wear it on your head
 	slot_flags = ITEM_SLOT_HEAD
+	prefered_slot_flags = ITEM_SLOT_IN_BACKPACK
 	resistance_flags = NONE
 	blocks_emissive = EMISSIVE_BLOCK_GENERIC
 	container_type = OPENCONTAINER