Well, I just make a little and simple script to transform the original backacpk to demon backpack when you burn it :blink:
Lua:
function onUse(cid, item, fromPosition, itemEx, toPosition)
if(itemEx.itemid == 1988) then
doTransformItem(itemEx.uid, 10518)
doRemoveItem(item.uid,1)
doSendMagicEffect(toPosition, 6)
return TRUE
end
end