Replaced codersprite for bloodpack with new ones.

Also now sprite changes depending on how filed bag is.

code/modules/reagents/reagent_containers/blood_pack.dm

@@ -2,6 +2,7 @@
 	name = "BloodPack"
 	desc = "Contains blood used for transfusion."
 	icon = 'icons/obj/bloodpack.dmi'
+	icon_state = "empty"
 	volume = 200
 
 	var/blood_type = null
@@ -11,6 +12,17 @@
 		if(blood_type != null)
 			name = "BloodPack [blood_type]"
 			reagents.add_reagent("blood", 200, list("donor"=null,"viruses"=null,"blood_DNA"=null,"blood_type"=blood_type,"resistances"=null,"trace_chem"=null))
+			update_icon()
+
+	on_reagent_change()
+		update_icon()
+
+	update_icon()
+		var/percent = round((reagents.total_volume / volume) * 100)
+		switch(percent)
+			if(0 to 9)			icon_state = "empty"
+			if(10 to 50) 		icon_state = "half"
+			if(51 to INFINITY)	icon_state = "full"
 
 /obj/item/weapon/reagent_containers/blood/APlus
 	blood_type = "A+"