Verb Issue in Developer Help
mob/verb/Open(var/obj/packs/O in usr.items)
mob/verb/Open() for(var/obj/packs/O in usr.items) //Insert whatever you're going to do with 'O' here.
obj/packs/verb/Open() set src in usr.items //only gives the verb to the player if the item is in the player's contents. //set src in oview(1) //switch the above to this one if you want it to be accessed by standing next to the object.
obj/packs obj1 obj2 obj3 obj4 //even sub-nodes will get the verb. verb/Open() set src in usr.items // [inert what you want to do here]