Most play yards are designed for portability—to fit through a door, be moved from one room to another, or folded up to fit in the trunk of your car. Many are rectangular, usually 28 by 40 inches. A basic model such as the Cosco Funsport Travel Play Yard (about $55) has mesh on all sides and comes with a travel bag. Another lightweight model, Graco's Pack ‘n Play Playard/Circle Time (about $57), weighs about 20 pounds.
Nice to keep baby out of trouble at home. Once he became mobile we had to do an "upgrade" as we noticed he was starting to hit his head on the X shaped metal bars. We tried some alternatives but the best so far was wrapping the metal bars with pool noodles (see picture). You'll need 8 pool noodles and some cuts (buy some extra in case you mess up). Use 2/3 of a pool noodle to wrap the internal bars and the remaining 1/3 to wrap half of the external bar. The pieces will also need a longitudinal cut along the length to fit the bar in. You'll also need some small cuts in the middle of the longer piece to fit the center rivet, where the mesh is attached to the bars. We got the pool noodles at the dollar store nearby for less than $10 and since ... full review