Lua Script for Avesta 7.6

[Erevius]

Dear OTLanders.
I'd like to make that script below works on 7.6 Avesta but I have no f*** idea how to.
So here is the basic script I want to rebuild later:

function onUse(cid, item, frompos, item2, topos)
	bagid = 1997
	itemspack1 = {{2139, 1},{2148, 100}}
	itemspack2 = {{2170, 1},{2152, 3}}
	itemspack3 = {{2174, 1},{2160, 1}}
	
	if getPlayerStorageValue(cid, item.uid) >= 1 then
		los = math.random(1,6)
		if los == 1
			bag = doPlayerAddItem(cid, bagid, 1)
			doAddContainerItem(bag, itemspack1[1], itemspack1[2]) -- (bag, itemid, subType/count)
			doPlayerSendTextMessage(cid, 22, "You have found ".. getItemDescriptions(bagid).article .." ".. getItemDescriptions(bagid).name ..".")
		elseif los == 2
			doAddContainerItem(bag, itemspack2[1], itemspack2[2]) -- (bag, itemid, subType/count)
			doPlayerSendTextMessage(cid, 22, "You have found ".. getItemDescriptions(bagid).article .." ".. getItemDescriptions(bagid).name ..".")
		elseif los == 3
			doAddContainerItem(bag, itemspack1[1], itemspack1[2]) -- (bag, itemid, subType/count)
			doPlayerSendTextMessage(cid, 22, "You have found ".. getItemDescriptions(bagid).article .." ".. getItemDescriptions(bagid).name ..".")
		else
			doPlayerSendTextMessage(cid, 22, "Missed")
		end
end
	return 1
end

As you can see I want the script to give a chance to win a reward which is a bag with 3 different item packs.
Is it possible to avoid something like this?:

doAddContainerItem(bag, <id>, <type>)
doAddContainerItem(bag, <id>, <type>)
doAddContainerItem(bag, <id>, <type>)

Hmm... Maybye:

for i=1, numberofitems do
	doAddContainerItem(bag, <ids>, <types>)
end

Please help me! (REP++)