  We study the bi-Lipschitz classification of Bedford-McMullen carpets which
are totally disconnected. Let $E$ be a such carpet and let $\mu_E$ be the
uniform Bernoulli measure on $E$. We show that the multifractal spectrum and
the doubling property of $\mu_E$ are both invariant under a bi-Lipschitz map.
Moreover, we show that if $\mu_E$ and $\mu_F$ are doubling, then a bi-Lipschitz
map between $E$ and $F$ enjoys a certain measure preserving property.
