Dufflebag of Holding

Adds a dufflebag of holding, essentially a bag of holding reskin that functions exactly identical

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

@@ -47,6 +47,10 @@
 	max_storage_space = ITEMSIZE_COST_NORMAL * 14 // 56
 	storage_cost = INVENTORY_STANDARD_SPACE + 1
 
+/obj/item/weapon/storage/backpack/holding/duffle
+	name = "dufflebag of holding"
+	icon_state = "holdingduffle"
+
 /obj/item/weapon/storage/backpack/holding/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if(istype(W, /obj/item/weapon/storage/backpack/holding))
 		user << "<span class='warning'>The Bluespace interfaces of the two devices conflict and malfunction.</span>"

code/modules/research/designs.dm

@@ -842,6 +842,15 @@ other types of metals and chemistry for reagents).
 	build_path = /obj/item/weapon/storage/backpack/holding
 	sort_string = "VAEAA"
 
+/datum/design/item/dufflebag_holding
+	name = "'DuffleBag of Holding', an infinite capacity dufflebag prototype"
+	desc = "A minaturized prototype of the popular Bag of Holding, the Dufflebag of Holding is, functionally, identical to the bag of holding, but comes in a more stylish and compact form."
+	id = "bag_holding"
+	req_tech = list(TECH_BLUESPACE = 4, TECH_MATERIAL = 6)
+	materials = list("gold" = 3000, "diamond" = 1500, "uranium" = 250)
+	build_path = /obj/item/weapon/storage/backpack/holding/duffle
+	sort_string = "VAEAB"
+
 /datum/design/item/binaryencrypt
 	name = "Binary encryption key"
 	desc = "Allows for deciphering the binary channel on-the-fly."