Pick something in your back pack and set the !Item variable.
*Note you may see ghosting here, because it happens fairly quickly
set !Item BHHWFRD ; This can be anything in your pack
;Open the pack to get the coords of teh pack
event macro 8 7
set !ContX #ContPosX
set !ContY #ContPosY
finditem !Item C_ , #BackPackID
if #FindCNT > 0
{
  set !origX #FindX - #ContPosX ;The find x is a screen coord the subtraction is to account for teh container offset
  set !origY #FindY - #ContPosY
	Exevent Drag #findid
	wait 10
	Exevent Dropc #backpackid  ;drops in a random location in backpack or stacks with existing
	wait 10
  event macro 2 0 that thing could be anywhere
	Exevent Drag #findid
	wait 10
	event macro 2 0 !origX !origY
	Exevent Dropc #backpackid !origX !origY
	wait 10
  event macro 2 0 that thing could be anywhere
}
else
{
  display ok Pick something IN your pack
}
halt