Or you can use Walker.Delay()

Code:
-- Backpack Configuration:

local MainBP      = "Jewelled Backpack"   --- Main Backpack (On your equipment slot)
local LootBP      = "Fur Backpack"        --- Backpack for loot
local SuppliesBP  = "Red Backpack"        --- Backpack for supplies
local AmmoBP      = "Blue Backpack"       --- Backpack for ammunition

local NumBackpacks = 4                    --- Number of total backpacks open


Module.New('OpenContainers', function(BpMod)
    if #Container.GetAll() < NumBackpacks then
        Walker.Delay(6000)
        print("Opening Backpacks...")        
        Self.CloseContainers()
        Self.OpenMainBackpack(true):OpenChildren({LootBP, true},{SuppliesBP, true},{AmmoBP, true})
        wait(200, 500)
    end
    BpMod:Delay(1000)
end)