S.M.
We use one of these when we are at my in-laws:
http://www.amazon.com/Cosco-10-T58-WHO-Portable-Crib-Whit...
I like it better than the pack-n-plays and other port-a-cribs we've used in hotels, etc. It folds flat, but is sturdy when set up. My nieces used them for years. There are two mattress positions, great for newborns and older babes.