Hmm, not sure exactly what metric you are after like weighing an empty box of the same dimensions as a Lego set box or the gauge of cardboard used, but the boxes seem exactly the same as the last round which was an upgrade from the Castle in the Forest round that used the thinner cardboard and were single flap closures, these have double flaps. My last shipment arrives today, snack shack x2 and I will post a picture but saw on FB someone’s arrived demolished.