You cannot define the type of an object on declaration in vbscript so that makes it hard to create objects like Collections. Fortunaly there's a workaround:
Sub %Method%(obj)
Dim Bag
Set Bag = CreateObject ("System.Collections.ArrayList")
Bag.Add "Lipstick"
Bag.Add obj
MsgBox Bag.Count & ": " & Bag.Item(0)
End Sub