  Let $Q_d$ be the $d$-dimensional Hamming cube and $N=|V(Q_d)|=2^d$. An
independent set $I$ in $Q_d$ is called balanced if $I$ contains the same number
of even and odd vertices. We show that the logarithm of the number of balanced
independent sets in $Q_d$ is \[(1-\Theta(1/\sqrt d))N/2.\] The key ingredient
of the proof is an improved version of "Sapozhenko's graph container lemma."
