Nora only used the suitcase to carry the dress she made for the gig (traditional Russian dress and dance routine?). I don't believe she will be away overnight.
I have never seen Kiko read books!! He loves to watch shitty movies and find as many ways as possible to ignore Nora. He will forever remain skinny like golum as he never eats anything more solid than soup and bread! I bet he shits through the eye of a needle every time he goes!!!! :)
Having said all that, Kiko is the luckiest man alive! He gets to upset Nora, gets to ignore her and treat her like shit and still gets to fuck her every which way and in every hole!! Respect!!!